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SSL VPN does not connect after upgrade to SFOS 18.0.3 MR-3

April Beachy over 4 years ago

We upgraded one of our Firewalls to SFOS 18.0.3 MR-3 from 18.0.1 MR1 and our SSL VPN clients quit working.

We get the error:

the system tried to join a drive to a directory on a joined drive

Any thoughts on the cause?

This thread was automatically locked due to age.

Top Replies

emmosophos over 4 years ago +1

Hello April, Thank you for contacting the Sophos Community! Please check if you don't have any DNAT rule with the service set as ANY. If you don't have any DNAT rule with service set as ANY, please…

Parents

0 April Beachy over 4 years ago

No DNAT:

Server log

Tue Nov 3 00:28:28 2020 [8020] TCP connection established with [AF_INET6]::ffff:107.6.183.162:34169
Tue Nov 3 00:28:28 2020 [8020] ::ffff:107.6.183.162 WARNING: Bad encapsulated packet length from peer (5635), which must be > 0 and <= 1572 -- please ensure that --tun-mtu or --link-mtu is equal on both peers -- this condition could also indicate a possible active attack on the TCP link -- [Attempting restart...]
Tue Nov 3 00:28:28 2020 [8020] ::ffff:107.6.183.162 Connection reset, restarting [0]
Tue Nov 3 00:28:28 2020 [8020] ::ffff:107.6.183.162 SIGUSR1[soft,connection-reset] received, client-instance restarting
Tue Nov 3 00:28:28 2020 [8020] TCP connection established with [AF_INET6]::ffff:107.6.183.162:34660
Tue Nov 3 00:28:28 2020 [8020] ::ffff:107.6.183.162 WARNING: Bad encapsulated packet length from peer (18245), which must be > 0 and <= 1572 -- please ensure that --tun-mtu or --link-mtu is equal on both peers -- this condition could also indicate a possible active attack on the TCP link -- [Attempting restart...]
Tue Nov 3 00:28:28 2020 [8020] ::ffff:107.6.183.162 Connection reset, restarting [0]
Tue Nov 3 00:28:28 2020 [8020] ::ffff:107.6.183.162 SIGUSR1[soft,connection-reset] received, client-instance restarting
Tue Nov 3 00:28:29 2020 [8020] TCP connection established with [AF_INET6]::ffff:107.6.183.162:35366
Tue Nov 3 00:28:29 2020 [8020] ::ffff:107.6.183.162 WARNING: Bad encapsulated packet length from peer (21331), which must be > 0 and <= 1572 -- please ensure that --tun-mtu or --link-mtu is equal on both peers -- this condition could also indicate a possible active attack on the TCP link -- [Attempting restart...]
Tue Nov 3 00:28:29 2020 [8020] ::ffff:107.6.183.162 Connection reset, restarting [0]
Tue Nov 3 00:28:29 2020 [8020] ::ffff:107.6.183.162 SIGUSR1[soft,connection-reset] received, client-instance restarting
Tue Nov 3 00:28:29 2020 [8020] TCP connection established with [AF_INET6]::ffff:107.6.183.162:36260
Tue Nov 3 00:28:34 2020 [8020] ::ffff:107.6.183.162 Connection reset, restarting [0]
Tue Nov 3 00:28:34 2020 [8020] ::ffff:107.6.183.162 SIGUSR1[soft,connection-reset] received, client-instance restarting
Tue Nov 3 00:28:35 2020 [8020] TCP connection established with [AF_INET6]::ffff:107.6.183.162:44330
Tue Nov 3 00:28:42 2020 [8020] CID is :3205
Tue Nov 3 00:28:43 2020 [8020] ::ffff:107.6.183.162 Connection reset, restarting [0]
Tue Nov 3 00:28:43 2020 [8020] ::ffff:107.6.183.162 SIGUSR1[soft,connection-reset] received, client-instance restarting
Tue Nov 3 00:28:43 2020 [8020] TCP connection established with [AF_INET6]::ffff:107.6.183.162:57314
Tue Nov 3 00:28:43 2020 [8020] ::ffff:107.6.183.162 WARNING: Bad encapsulated packet length from peer (5635), which must be > 0 and <= 1572 -- please ensure that --tun-mtu or --link-mtu is equal on both peers -- this condition could also indicate a possible active attack on the TCP link -- [Attempting restart...]
Tue Nov 3 00:28:43 2020 [8020] ::ffff:107.6.183.162 Connection reset, restarting [0]
Tue Nov 3 00:28:43 2020 [8020] ::ffff:107.6.183.162 SIGUSR1[soft,connection-reset] received, client-instance restarting
Tue Nov 3 00:28:44 2020 [8020] TCP connection established with [AF_INET6]::ffff:107.6.183.162:58512
Tue Nov 3 00:28:44 2020 [8020] ::ffff:107.6.183.162 WARNING: Bad encapsulated packet length from peer (5635), which must be > 0 and <= 1572 -- please ensure that --tun-mtu or --link-mtu is equal on both peers -- this condition could also indicate a possible active attack on the TCP link -- [Attempting restart...]
Tue Nov 3 00:28:44 2020 [8020] ::ffff:107.6.183.162 Connection reset, restarting [0]
Tue Nov 3 00:28:44 2020 [8020] ::ffff:107.6.183.162 SIGUSR1[soft,connection-reset] received, client-instance restarting
Tue Nov 3 00:28:44 2020 [8020] TCP connection established with [AF_INET6]::ffff:107.6.183.162:60958
Tue Nov 3 00:28:44 2020 [8020] ::ffff:107.6.183.162 WARNING: Bad encapsulated packet length from peer (32814), which must be > 0 and <= 1572 -- please ensure that --tun-mtu or --link-mtu is equal on both peers -- this condition could also indicate a possible active attack on the TCP link -- [Attempting restart...]
Tue Nov 3 00:28:44 2020 [8020] ::ffff:107.6.183.162 Connection reset, restarting [0]
Tue Nov 3 00:28:44 2020 [8020] ::ffff:107.6.183.162 SIGUSR1[soft,connection-reset] received, client-instance restarting
Tue Nov 3 01:19:19 2020 [8020] TCP connection established with [AF_INET6]::ffff:128.14.134.170:47674
Tue Nov 3 01:19:19 2020 [8020] ::ffff:128.14.134.170 WARNING: Bad encapsulated packet length from peer (5635), which must be > 0 and <= 1572 -- please ensure that --tun-mtu or --link-mtu is equal on both peers -- this condition could also indicate a possible active attack on the TCP link -- [Attempting restart...]
Tue Nov 3 01:19:19 2020 [8020] ::ffff:128.14.134.170 Connection reset, restarting [0]
Tue Nov 3 01:19:19 2020 [8020] ::ffff:128.14.134.170 SIGUSR1[soft,connection-reset] received, client-instance restarting
Tue Nov 3 04:44:34 2020 [8020] TCP connection established with [AF_INET6]::ffff:46.246.62.206:36474
Tue Nov 3 04:44:34 2020 [8020] ::ffff:46.246.62.206 WARNING: Bad encapsulated packet length from peer (5635), which must be > 0 and <= 1572 -- please ensure that --tun-mtu or --link-mtu is equal on both peers -- this condition could also indicate a possible active attack on the TCP link -- [Attempting restart...]
Tue Nov 3 04:44:34 2020 [8020] ::ffff:46.246.62.206 Connection reset, restarting [0]
Tue Nov 3 04:44:34 2020 [8020] ::ffff:46.246.62.206 SIGUSR1[soft,connection-reset] received, client-instance restarting
Tue Nov 3 05:29:13 2020 [8020] TCP connection established with [AF_INET6]::ffff:182.124.56.252:47450
Tue Nov 3 05:29:14 2020 [8020] ::ffff:182.124.56.252 WARNING: Bad encapsulated packet length from peer (18245), which must be > 0 and <= 1572 -- please ensure that --tun-mtu or --link-mtu is equal on both peers -- this condition could also indicate a possible active attack on the TCP link -- [Attempting restart...]
Tue Nov 3 05:29:14 2020 [8020] ::ffff:182.124.56.252 Connection reset, restarting [0]
Tue Nov 3 05:29:14 2020 [8020] ::ffff:182.124.56.252 SIGUSR1[soft,connection-reset] received, client-instance restarting
Tue Nov 3 05:48:26 2020 [8020] TCP connection established with [AF_INET6]::ffff:51.254.75.176:59938
Tue Nov 3 05:48:26 2020 [8020] ::ffff:51.254.75.176 WARNING: Bad encapsulated packet length from peer (5635), which must be > 0 and <= 1572 -- please ensure that --tun-mtu or --link-mtu is equal on both peers -- this condition could also indicate a possible active attack on the TCP link -- [Attempting restart...]
Tue Nov 3 05:48:26 2020 [8020] ::ffff:51.254.75.176 Connection reset, restarting [0]
Tue Nov 3 05:48:26 2020 [8020] ::ffff:51.254.75.176 SIGUSR1[soft,connection-reset] received, client-instance restarting
Tue Nov 3 05:52:58 2020 [8020] TCP connection established with [AF_INET6]::ffff:138.68.26.56:57930
Tue Nov 3 05:52:58 2020 [8020] ::ffff:138.68.26.56 WARNING: Bad encapsulated packet length from peer (5635), which must be > 0 and <= 1572 -- please ensure that --tun-mtu or --link-mtu is equal on both peers -- this condition could also indicate a possible active attack on the TCP link -- [Attempting restart...]
Tue Nov 3 05:52:58 2020 [8020] ::ffff:138.68.26.56 Connection reset, restarting [0]
Tue Nov 3 05:52:58 2020 [8020] ::ffff:138.68.26.56 SIGUSR1[soft,connection-reset] received, client-instance restarting
Tue Nov 3 05:55:36 2020 [8020] TCP connection established with [AF_INET6]::ffff:51.254.75.188:49788
Tue Nov 3 05:55:36 2020 [8020] ::ffff:51.254.75.188 WARNING: Bad encapsulated packet length from peer (5635), which must be > 0 and <= 1572 -- please ensure that --tun-mtu or --link-mtu is equal on both peers -- this condition could also indicate a possible active attack on the TCP link -- [Attempting restart...]
Tue Nov 3 05:55:36 2020 [8020] ::ffff:51.254.75.188 Connection reset, restarting [0]
Tue Nov 3 05:55:36 2020 [8020] ::ffff:51.254.75.188 SIGUSR1[soft,connection-reset] received, client-instance restarting
Tue Nov 3 06:21:10 2020 [8020] TCP connection established with [AF_INET6]::ffff:216.218.206.66:35538
Tue Nov 3 06:21:10 2020 [8020] ::ffff:216.218.206.66 WARNING: Bad encapsulated packet length from peer (5635), which must be > 0 and <= 1572 -- please ensure that --tun-mtu or --link-mtu is equal on both peers -- this condition could also indicate a possible active attack on the TCP link -- [Attempting restart...]
Tue Nov 3 06:21:10 2020 [8020] ::ffff:216.218.206.66 Connection reset, restarting [0]
Tue Nov 3 06:21:10 2020 [8020] ::ffff:216.218.206.66 SIGUSR1[soft,connection-reset] received, client-instance restarting
Tue Nov 3 06:23:09 2020 [8020] Closing TUN/TAP interface
Tue Nov 3 06:23:09 2020 [8020] /bin/ip addr del dev tun0 10.255.255.1/24
Tue Nov 3 06:23:10 2020 [8020] /bin/ip -6 addr del 2001:db8::1:0/64 dev tun0
Tue Nov 3 06:23:10 2020 [8020] PLUGIN_CLOSE: /lib/openvpn-plugin-utm.so
Tue Nov 3 06:23:10 2020 [8020] SIGTERM[hard,] received, process exiting
Tue Nov 3 06:32:01 2020 [10749] OpenVPN 2.3.6 i486-openwrt-linux-gnu [SSL (OpenSSL)] [LZO] [EPOLL] [MH] [IPv6] built on Oct 8 2020
Tue Nov 3 06:32:01 2020 [10749] library versions: OpenSSL 1.0.2r-fips 26 Feb 2019, LZO 2.09
Tue Nov 3 06:32:01 2020 [10749] MANAGEMENT: client_uid=0
Tue Nov 3 06:32:01 2020 [10749] MANAGEMENT: unix domain socket listening on /tmp/openvpn_mgmt
Tue Nov 3 06:32:01 2020 [10749] cleanup success
Tue Nov 3 06:32:01 2020 [10749] WARNING: using --duplicate-cn and --client-config-dir together is probably not what you want
Tue Nov 3 06:32:01 2020 [10749] WARNING: --ifconfig-pool-persist will not work with --duplicate-cn
Tue Nov 3 06:32:01 2020 [10749] NOTE: the current --script-security setting may allow this configuration to call user-defined scripts
grhandle=0x926b530
Authentication server 127.0.0.1 gave login response code 2
Tue Nov 3 06:32:01 2020 [10749] PLUGIN_INIT: POST /lib/openvpn-plugin-utm.so '[/lib/openvpn-plugin-utm.so]' intercepted=PLUGIN_AUTH_USER_PASS_VERIFY|PLUGIN_CLIENT_CONNECT|PLUGIN_CLIENT_DISCONNECT
Tue Nov 3 06:32:01 2020 [10749] Diffie-Hellman initialized with 2048 bit key
Tue Nov 3 06:32:01 2020 [10749] WARNING: file '/conf/certificate/private/ApplianceCertificate.key' is group or others accessible
Tue Nov 3 06:32:01 2020 [10749] WARNING: experimental option --capath /conf/certificate/openvpn
Tue Nov 3 06:32:01 2020 [10749] Socket Buffers: R=[87380->87380] S=[16384->16384]
Tue Nov 3 06:32:01 2020 [10749] TUN/TAP device tun0 opened
Tue Nov 3 06:32:01 2020 [10749] TUN/TAP TX queue length set to 1000
Tue Nov 3 06:32:01 2020 [10749] do_ifconfig, tt->ipv6=1, tt->did_ifconfig_ipv6_setup=1
Tue Nov 3 06:32:01 2020 [10749] /bin/ip link set dev tun0 up mtu 1500
Tue Nov 3 06:32:01 2020 [10749] /bin/ip addr add dev tun0 10.255.255.1/24 broadcast 10.255.255.255
Tue Nov 3 06:32:01 2020 [10749] /bin/ip -6 addr add 2001:db8::1:0/64 dev tun0
Tue Nov 3 06:32:01 2020 [10749] CSC service status updated to RUNNING
Tue Nov 3 06:32:01 2020 [10749] Listening for incoming TCP connection on [undef]
Tue Nov 3 06:32:01 2020 [10749] TCPv6_SERVER link local (bound): [undef]
Tue Nov 3 06:32:01 2020 [10749] TCPv6_SERVER link remote: [undef]
Tue Nov 3 06:32:01 2020 [10749] MULTI: multi_init called, r=256 v=256
Tue Nov 3 06:32:01 2020 [10749] IFCONFIG POOL IPv6: (IPv4) size=253, size_ipv6=65536, netbits=64, base_ipv6=2001:db8::1:1
Tue Nov 3 06:32:01 2020 [10749] IFCONFIG POOL: base=10.255.255.2 size=253, ipv6=1
Tue Nov 3 06:32:01 2020 [10749] IFCONFIG POOL LIST
Tue Nov 3 06:32:01 2020 [10749] MULTI: TCP INIT maxclients=440 maxevents=444
Tue Nov 3 06:32:01 2020 [10749] Initialization Sequence Completed
Tue Nov 3 08:31:21 2020 [10749] MANAGEMENT: Client connected from /tmp/openvpn_mgmt
Tue Nov 3 08:31:21 2020 [10749] MANAGEMENT: CMD 'status -1'
Tue Nov 3 08:31:31 2020 [10749] MANAGEMENT: Client disconnected

Client log

Thu Nov 05 11:41:16 2020 OpenVPN 2.3.8 i686-w64-mingw32 [SSL (OpenSSL)] [LZO] [IPv6] built on Jul 3 2017
Thu Nov 05 11:41:16 2020 library versions: OpenSSL 1.0.2l 25 May 2017, LZO 2.09
Enter Management Password:
Thu Nov 05 11:41:16 2020 MANAGEMENT: TCP Socket listening on [AF_INET]127.0.0.1:25340
Thu Nov 05 11:41:16 2020 Need hold release from management interface, waiting...
Thu Nov 05 11:41:17 2020 MANAGEMENT: Client connected from [AF_INET]127.0.0.1:25340
Thu Nov 05 11:41:17 2020 MANAGEMENT: CMD 'state on'
Thu Nov 05 11:41:17 2020 MANAGEMENT: CMD 'log all on'
Thu Nov 05 11:41:17 2020 MANAGEMENT: CMD 'hold off'
Thu Nov 05 11:41:17 2020 MANAGEMENT: CMD 'hold release'
Thu Nov 05 11:41:26 2020 MANAGEMENT: CMD 'username "Auth" "pompey"'
Thu Nov 05 11:41:26 2020 MANAGEMENT: CMD 'password [...]'
Thu Nov 05 11:41:26 2020 Socket Buffers: R=[65536->65536] S=[65536->65536]
Thu Nov 05 11:41:26 2020 Attempting to establish TCP connection with [AF_INET]68.142.164.248:8443 [nonblock]
Thu Nov 05 11:41:26 2020 MANAGEMENT: >STATE:1604594486,TCP_CONNECT,,,,,,
Thu Nov 05 11:41:36 2020 TCP: connect to [AF_INET]68.142.164.248:8443 failed, will try again in 5 seconds: The system tried to join a drive to a directory on a joined drive.
Thu Nov 05 11:41:40 2020 SIGTERM[hard,init_instance] received, process exiting
Thu Nov 05 11:41:40 2020 MANAGEMENT: >STATE:1604594500,EXITING,init_instance,,,,,
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0 April Beachy over 4 years ago

No DNAT:

Server log

Tue Nov 3 00:28:28 2020 [8020] TCP connection established with [AF_INET6]::ffff:107.6.183.162:34169
Tue Nov 3 00:28:28 2020 [8020] ::ffff:107.6.183.162 WARNING: Bad encapsulated packet length from peer (5635), which must be > 0 and <= 1572 -- please ensure that --tun-mtu or --link-mtu is equal on both peers -- this condition could also indicate a possible active attack on the TCP link -- [Attempting restart...]
Tue Nov 3 00:28:28 2020 [8020] ::ffff:107.6.183.162 Connection reset, restarting [0]
Tue Nov 3 00:28:28 2020 [8020] ::ffff:107.6.183.162 SIGUSR1[soft,connection-reset] received, client-instance restarting
Tue Nov 3 00:28:28 2020 [8020] TCP connection established with [AF_INET6]::ffff:107.6.183.162:34660
Tue Nov 3 00:28:28 2020 [8020] ::ffff:107.6.183.162 WARNING: Bad encapsulated packet length from peer (18245), which must be > 0 and <= 1572 -- please ensure that --tun-mtu or --link-mtu is equal on both peers -- this condition could also indicate a possible active attack on the TCP link -- [Attempting restart...]
Tue Nov 3 00:28:28 2020 [8020] ::ffff:107.6.183.162 Connection reset, restarting [0]
Tue Nov 3 00:28:28 2020 [8020] ::ffff:107.6.183.162 SIGUSR1[soft,connection-reset] received, client-instance restarting
Tue Nov 3 00:28:29 2020 [8020] TCP connection established with [AF_INET6]::ffff:107.6.183.162:35366
Tue Nov 3 00:28:29 2020 [8020] ::ffff:107.6.183.162 WARNING: Bad encapsulated packet length from peer (21331), which must be > 0 and <= 1572 -- please ensure that --tun-mtu or --link-mtu is equal on both peers -- this condition could also indicate a possible active attack on the TCP link -- [Attempting restart...]
Tue Nov 3 00:28:29 2020 [8020] ::ffff:107.6.183.162 Connection reset, restarting [0]
Tue Nov 3 00:28:29 2020 [8020] ::ffff:107.6.183.162 SIGUSR1[soft,connection-reset] received, client-instance restarting
Tue Nov 3 00:28:29 2020 [8020] TCP connection established with [AF_INET6]::ffff:107.6.183.162:36260
Tue Nov 3 00:28:34 2020 [8020] ::ffff:107.6.183.162 Connection reset, restarting [0]
Tue Nov 3 00:28:34 2020 [8020] ::ffff:107.6.183.162 SIGUSR1[soft,connection-reset] received, client-instance restarting
Tue Nov 3 00:28:35 2020 [8020] TCP connection established with [AF_INET6]::ffff:107.6.183.162:44330
Tue Nov 3 00:28:42 2020 [8020] CID is :3205
Tue Nov 3 00:28:43 2020 [8020] ::ffff:107.6.183.162 Connection reset, restarting [0]
Tue Nov 3 00:28:43 2020 [8020] ::ffff:107.6.183.162 SIGUSR1[soft,connection-reset] received, client-instance restarting
Tue Nov 3 00:28:43 2020 [8020] TCP connection established with [AF_INET6]::ffff:107.6.183.162:57314
Tue Nov 3 00:28:43 2020 [8020] ::ffff:107.6.183.162 WARNING: Bad encapsulated packet length from peer (5635), which must be > 0 and <= 1572 -- please ensure that --tun-mtu or --link-mtu is equal on both peers -- this condition could also indicate a possible active attack on the TCP link -- [Attempting restart...]
Tue Nov 3 00:28:43 2020 [8020] ::ffff:107.6.183.162 Connection reset, restarting [0]
Tue Nov 3 00:28:43 2020 [8020] ::ffff:107.6.183.162 SIGUSR1[soft,connection-reset] received, client-instance restarting
Tue Nov 3 00:28:44 2020 [8020] TCP connection established with [AF_INET6]::ffff:107.6.183.162:58512
Tue Nov 3 00:28:44 2020 [8020] ::ffff:107.6.183.162 WARNING: Bad encapsulated packet length from peer (5635), which must be > 0 and <= 1572 -- please ensure that --tun-mtu or --link-mtu is equal on both peers -- this condition could also indicate a possible active attack on the TCP link -- [Attempting restart...]
Tue Nov 3 00:28:44 2020 [8020] ::ffff:107.6.183.162 Connection reset, restarting [0]
Tue Nov 3 00:28:44 2020 [8020] ::ffff:107.6.183.162 SIGUSR1[soft,connection-reset] received, client-instance restarting
Tue Nov 3 00:28:44 2020 [8020] TCP connection established with [AF_INET6]::ffff:107.6.183.162:60958
Tue Nov 3 00:28:44 2020 [8020] ::ffff:107.6.183.162 WARNING: Bad encapsulated packet length from peer (32814), which must be > 0 and <= 1572 -- please ensure that --tun-mtu or --link-mtu is equal on both peers -- this condition could also indicate a possible active attack on the TCP link -- [Attempting restart...]
Tue Nov 3 00:28:44 2020 [8020] ::ffff:107.6.183.162 Connection reset, restarting [0]
Tue Nov 3 00:28:44 2020 [8020] ::ffff:107.6.183.162 SIGUSR1[soft,connection-reset] received, client-instance restarting
Tue Nov 3 01:19:19 2020 [8020] TCP connection established with [AF_INET6]::ffff:128.14.134.170:47674
Tue Nov 3 01:19:19 2020 [8020] ::ffff:128.14.134.170 WARNING: Bad encapsulated packet length from peer (5635), which must be > 0 and <= 1572 -- please ensure that --tun-mtu or --link-mtu is equal on both peers -- this condition could also indicate a possible active attack on the TCP link -- [Attempting restart...]
Tue Nov 3 01:19:19 2020 [8020] ::ffff:128.14.134.170 Connection reset, restarting [0]
Tue Nov 3 01:19:19 2020 [8020] ::ffff:128.14.134.170 SIGUSR1[soft,connection-reset] received, client-instance restarting
Tue Nov 3 04:44:34 2020 [8020] TCP connection established with [AF_INET6]::ffff:46.246.62.206:36474
Tue Nov 3 04:44:34 2020 [8020] ::ffff:46.246.62.206 WARNING: Bad encapsulated packet length from peer (5635), which must be > 0 and <= 1572 -- please ensure that --tun-mtu or --link-mtu is equal on both peers -- this condition could also indicate a possible active attack on the TCP link -- [Attempting restart...]
Tue Nov 3 04:44:34 2020 [8020] ::ffff:46.246.62.206 Connection reset, restarting [0]
Tue Nov 3 04:44:34 2020 [8020] ::ffff:46.246.62.206 SIGUSR1[soft,connection-reset] received, client-instance restarting
Tue Nov 3 05:29:13 2020 [8020] TCP connection established with [AF_INET6]::ffff:182.124.56.252:47450
Tue Nov 3 05:29:14 2020 [8020] ::ffff:182.124.56.252 WARNING: Bad encapsulated packet length from peer (18245), which must be > 0 and <= 1572 -- please ensure that --tun-mtu or --link-mtu is equal on both peers -- this condition could also indicate a possible active attack on the TCP link -- [Attempting restart...]
Tue Nov 3 05:29:14 2020 [8020] ::ffff:182.124.56.252 Connection reset, restarting [0]
Tue Nov 3 05:29:14 2020 [8020] ::ffff:182.124.56.252 SIGUSR1[soft,connection-reset] received, client-instance restarting
Tue Nov 3 05:48:26 2020 [8020] TCP connection established with [AF_INET6]::ffff:51.254.75.176:59938
Tue Nov 3 05:48:26 2020 [8020] ::ffff:51.254.75.176 WARNING: Bad encapsulated packet length from peer (5635), which must be > 0 and <= 1572 -- please ensure that --tun-mtu or --link-mtu is equal on both peers -- this condition could also indicate a possible active attack on the TCP link -- [Attempting restart...]
Tue Nov 3 05:48:26 2020 [8020] ::ffff:51.254.75.176 Connection reset, restarting [0]
Tue Nov 3 05:48:26 2020 [8020] ::ffff:51.254.75.176 SIGUSR1[soft,connection-reset] received, client-instance restarting
Tue Nov 3 05:52:58 2020 [8020] TCP connection established with [AF_INET6]::ffff:138.68.26.56:57930
Tue Nov 3 05:52:58 2020 [8020] ::ffff:138.68.26.56 WARNING: Bad encapsulated packet length from peer (5635), which must be > 0 and <= 1572 -- please ensure that --tun-mtu or --link-mtu is equal on both peers -- this condition could also indicate a possible active attack on the TCP link -- [Attempting restart...]
Tue Nov 3 05:52:58 2020 [8020] ::ffff:138.68.26.56 Connection reset, restarting [0]
Tue Nov 3 05:52:58 2020 [8020] ::ffff:138.68.26.56 SIGUSR1[soft,connection-reset] received, client-instance restarting
Tue Nov 3 05:55:36 2020 [8020] TCP connection established with [AF_INET6]::ffff:51.254.75.188:49788
Tue Nov 3 05:55:36 2020 [8020] ::ffff:51.254.75.188 WARNING: Bad encapsulated packet length from peer (5635), which must be > 0 and <= 1572 -- please ensure that --tun-mtu or --link-mtu is equal on both peers -- this condition could also indicate a possible active attack on the TCP link -- [Attempting restart...]
Tue Nov 3 05:55:36 2020 [8020] ::ffff:51.254.75.188 Connection reset, restarting [0]
Tue Nov 3 05:55:36 2020 [8020] ::ffff:51.254.75.188 SIGUSR1[soft,connection-reset] received, client-instance restarting
Tue Nov 3 06:21:10 2020 [8020] TCP connection established with [AF_INET6]::ffff:216.218.206.66:35538
Tue Nov 3 06:21:10 2020 [8020] ::ffff:216.218.206.66 WARNING: Bad encapsulated packet length from peer (5635), which must be > 0 and <= 1572 -- please ensure that --tun-mtu or --link-mtu is equal on both peers -- this condition could also indicate a possible active attack on the TCP link -- [Attempting restart...]
Tue Nov 3 06:21:10 2020 [8020] ::ffff:216.218.206.66 Connection reset, restarting [0]
Tue Nov 3 06:21:10 2020 [8020] ::ffff:216.218.206.66 SIGUSR1[soft,connection-reset] received, client-instance restarting
Tue Nov 3 06:23:09 2020 [8020] Closing TUN/TAP interface
Tue Nov 3 06:23:09 2020 [8020] /bin/ip addr del dev tun0 10.255.255.1/24
Tue Nov 3 06:23:10 2020 [8020] /bin/ip -6 addr del 2001:db8::1:0/64 dev tun0
Tue Nov 3 06:23:10 2020 [8020] PLUGIN_CLOSE: /lib/openvpn-plugin-utm.so
Tue Nov 3 06:23:10 2020 [8020] SIGTERM[hard,] received, process exiting
Tue Nov 3 06:32:01 2020 [10749] OpenVPN 2.3.6 i486-openwrt-linux-gnu [SSL (OpenSSL)] [LZO] [EPOLL] [MH] [IPv6] built on Oct 8 2020
Tue Nov 3 06:32:01 2020 [10749] library versions: OpenSSL 1.0.2r-fips 26 Feb 2019, LZO 2.09
Tue Nov 3 06:32:01 2020 [10749] MANAGEMENT: client_uid=0
Tue Nov 3 06:32:01 2020 [10749] MANAGEMENT: unix domain socket listening on /tmp/openvpn_mgmt
Tue Nov 3 06:32:01 2020 [10749] cleanup success
Tue Nov 3 06:32:01 2020 [10749] WARNING: using --duplicate-cn and --client-config-dir together is probably not what you want
Tue Nov 3 06:32:01 2020 [10749] WARNING: --ifconfig-pool-persist will not work with --duplicate-cn
Tue Nov 3 06:32:01 2020 [10749] NOTE: the current --script-security setting may allow this configuration to call user-defined scripts
grhandle=0x926b530
Authentication server 127.0.0.1 gave login response code 2
Tue Nov 3 06:32:01 2020 [10749] PLUGIN_INIT: POST /lib/openvpn-plugin-utm.so '[/lib/openvpn-plugin-utm.so]' intercepted=PLUGIN_AUTH_USER_PASS_VERIFY|PLUGIN_CLIENT_CONNECT|PLUGIN_CLIENT_DISCONNECT
Tue Nov 3 06:32:01 2020 [10749] Diffie-Hellman initialized with 2048 bit key
Tue Nov 3 06:32:01 2020 [10749] WARNING: file '/conf/certificate/private/ApplianceCertificate.key' is group or others accessible
Tue Nov 3 06:32:01 2020 [10749] WARNING: experimental option --capath /conf/certificate/openvpn
Tue Nov 3 06:32:01 2020 [10749] Socket Buffers: R=[87380->87380] S=[16384->16384]
Tue Nov 3 06:32:01 2020 [10749] TUN/TAP device tun0 opened
Tue Nov 3 06:32:01 2020 [10749] TUN/TAP TX queue length set to 1000
Tue Nov 3 06:32:01 2020 [10749] do_ifconfig, tt->ipv6=1, tt->did_ifconfig_ipv6_setup=1
Tue Nov 3 06:32:01 2020 [10749] /bin/ip link set dev tun0 up mtu 1500
Tue Nov 3 06:32:01 2020 [10749] /bin/ip addr add dev tun0 10.255.255.1/24 broadcast 10.255.255.255
Tue Nov 3 06:32:01 2020 [10749] /bin/ip -6 addr add 2001:db8::1:0/64 dev tun0
Tue Nov 3 06:32:01 2020 [10749] CSC service status updated to RUNNING
Tue Nov 3 06:32:01 2020 [10749] Listening for incoming TCP connection on [undef]
Tue Nov 3 06:32:01 2020 [10749] TCPv6_SERVER link local (bound): [undef]
Tue Nov 3 06:32:01 2020 [10749] TCPv6_SERVER link remote: [undef]
Tue Nov 3 06:32:01 2020 [10749] MULTI: multi_init called, r=256 v=256
Tue Nov 3 06:32:01 2020 [10749] IFCONFIG POOL IPv6: (IPv4) size=253, size_ipv6=65536, netbits=64, base_ipv6=2001:db8::1:1
Tue Nov 3 06:32:01 2020 [10749] IFCONFIG POOL: base=10.255.255.2 size=253, ipv6=1
Tue Nov 3 06:32:01 2020 [10749] IFCONFIG POOL LIST
Tue Nov 3 06:32:01 2020 [10749] MULTI: TCP INIT maxclients=440 maxevents=444
Tue Nov 3 06:32:01 2020 [10749] Initialization Sequence Completed
Tue Nov 3 08:31:21 2020 [10749] MANAGEMENT: Client connected from /tmp/openvpn_mgmt
Tue Nov 3 08:31:21 2020 [10749] MANAGEMENT: CMD 'status -1'
Tue Nov 3 08:31:31 2020 [10749] MANAGEMENT: Client disconnected

Client log

Thu Nov 05 11:41:16 2020 OpenVPN 2.3.8 i686-w64-mingw32 [SSL (OpenSSL)] [LZO] [IPv6] built on Jul 3 2017
Thu Nov 05 11:41:16 2020 library versions: OpenSSL 1.0.2l 25 May 2017, LZO 2.09
Enter Management Password:
Thu Nov 05 11:41:16 2020 MANAGEMENT: TCP Socket listening on [AF_INET]127.0.0.1:25340
Thu Nov 05 11:41:16 2020 Need hold release from management interface, waiting...
Thu Nov 05 11:41:17 2020 MANAGEMENT: Client connected from [AF_INET]127.0.0.1:25340
Thu Nov 05 11:41:17 2020 MANAGEMENT: CMD 'state on'
Thu Nov 05 11:41:17 2020 MANAGEMENT: CMD 'log all on'
Thu Nov 05 11:41:17 2020 MANAGEMENT: CMD 'hold off'
Thu Nov 05 11:41:17 2020 MANAGEMENT: CMD 'hold release'
Thu Nov 05 11:41:26 2020 MANAGEMENT: CMD 'username "Auth" "pompey"'
Thu Nov 05 11:41:26 2020 MANAGEMENT: CMD 'password [...]'
Thu Nov 05 11:41:26 2020 Socket Buffers: R=[65536->65536] S=[65536->65536]
Thu Nov 05 11:41:26 2020 Attempting to establish TCP connection with [AF_INET]68.142.164.248:8443 [nonblock]
Thu Nov 05 11:41:26 2020 MANAGEMENT: >STATE:1604594486,TCP_CONNECT,,,,,,
Thu Nov 05 11:41:36 2020 TCP: connect to [AF_INET]68.142.164.248:8443 failed, will try again in 5 seconds: The system tried to join a drive to a directory on a joined drive.
Thu Nov 05 11:41:40 2020 SIGTERM[hard,init_instance] received, process exiting
Thu Nov 05 11:41:40 2020 MANAGEMENT: >STATE:1604594500,EXITING,init_instance,,,,,
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0 LHerzog over 4 years ago in reply to April Beachy

looks like your MTU is too large with 1572

do you have PPPoE dial in on your XG WAN interface?

I would check the setting of your WAN Interface. Did the clients install new VPN configs after the upgrade or do they have the same?

for a workaround try if setting a fix smaller MTU on a client works.

but I guess the bug is inside XG, not the VPN client.
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0 April Beachy over 4 years ago in reply to LHerzog

Yes we have a PPPoE on our XG WAN interface.

I have tried with old config and a new VPN config.

I decreased the MTU from 1500 to 1000 and same error.
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