Softether VPN client gives error 1 unless DMZ or directly connected

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synergic
Posts: 2
Joined: Tue Oct 17, 2017 2:38 pm

Softether VPN client gives error 1 unless DMZ or directly connected

Post by synergic » Tue Oct 17, 2017 2:45 pm

Hello. I am having an issue with Softether VPN client giving error 1 when behind my SonicWall. If I bypass the firewall completely and connect the computer directly to the modem, Softether connects just fine and is fast and reliable. Same if I enable DMZ. But once I'm back safely behind my firewall, I get error 1 and no connection at all (unless I use VPN Azure which I don't like doing). What do I need to configure my firewall to allow in order to connect through it? It already allows ICMP. Thanks in advance.

synergic
Posts: 2
Joined: Tue Oct 17, 2017 2:38 pm

Re: Softether VPN client gives error 1 unless DMZ or directly connected

Post by synergic » Fri Oct 20, 2017 3:46 pm

Did a packet capture of a successful and unsuccessful connection attempt. In the unsuccessful attempt, the server's UDP responses are getting blocked. ICMP packets seem fine. Sonicwall dropping outbound malformed DNS packets?

thisjun
Posts: 2417
Joined: Mon Feb 24, 2014 11:03 am

Re: Softether VPN client gives error 1 unless DMZ or directly connected

Post by thisjun » Wed Nov 01, 2017 7:10 am

Did you enable VPN over ICMP configuration?

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