Guest User!

You are not Sophos Staff.

Thread Info
  • State Not Answered
  • Locked Locked
  • Replies 9 replies
  • Subscribers 1 subscriber
  • Views 1227 views
  • Users 0 members are here
Options
Suggested
This discussion has been locked.
You can no longer post new replies to this discussion. If you have a question you can start a new discussion

Broken TCP / Networkname not found / unvalid handle

DarkM
Hi there,

we have serveral problems when copying files through PPTP via SMB.
Router is ASG v8 VM on ESX5, Fileserver is Windows 2003 Server R2 VM ESX3, Clients are XP & W7:

After some time, every single copy task ends with errors like "Broken TCP" (Whireshark) / "Networkname not found (64)" / "Invalid handle", but the VPN itself never disconnects. The copied file may be different when it happens.

The problem is reducible to ASG, but I have no clue what to do. 
VM network interfaces are all "flexible", MTU is 1500. There is no QoS or IPS activated on ASG. There are no dropped packets coming from VPN clients nor internal hosts.

Overall performance over network is very poor when using PPTP. We see that bandwith changes regulary, literally in very regular intervalls, although no other copy process is involved.

Any ideas? Your help is really appreciated,

Kind regards,
Darkm


This thread was automatically locked due to age.
Parents Reply Children
  • 0 in reply to BAlfson
    Do you have 'Enable TCP Window scaling' checked on the 'Advanced' tab of 'Firewall'?  Are the other items not selected?

    Cheers - Bob


    Yes, TCP Windows scaling is checked, the others are not.

    Meanwhile I found something: It seems to be a good idea not to masquerade all taffic coming from VPN Pool going to internal network. Since I deactivated this rules copying works like a charm. I´ll keep an eye on that, maybe it´s just luck...

    Regards,
    DarkM