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Cisco AnyConnect (DTLS) to work, download is fast but upload very slow

Hi everyone,

I am using Sophos UTM 9 home and everything is working flawlessly except for my VPN connection to work. I searched the forum but have not been able to solve my problem.

Speedtest while connected to my work VPN is giving me 25mbits/0.10mbits for download/upload (vs 25/10 if connected directly in modem without Sophos UTM 9).

I turned off IPS, Anti-Dos/Flooding protection, portscan.

AnyConnect is using DTLS.

 

Far from being a Wireshark expert, I still made a tcpdump of my vpn host and it shows "version negociation" and "malformed packet" 99% of the time.

 

Sorry if this has been asked before but I have not been able to find a solution...

 

Anyone has a clue that could help me figure this out?

 

Thanks



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