Mar 11, 2019

Ok, I've tested the VPN from one of the PCs from the other domain which is at the remote site, and it has the same response - implying that there is a problem with that site as a whole, and not just the PCs trying to connect to the central site. How to fix the four biggest problems with VPN connections Mar 11, 2019 VPN ERROR 806 / 721 - monVPN VPN ERROR 806 / 721 Your firewall or ISP is blocking your VPN access. If this error appears for L2TP as well as for PPTP, use OpenVPN or monVPN Connect.

How to fix the four biggest problems with VPN connections

How to Fix 'The L2TP Connection Attempt Failed Because the Sep 06, 2019

Well according to the specs of that device, it supports VPN passthru. Have you found the option to enable this? Unfortunately I don't know the sonicwalls interface so I can't help you, but if it supports it there should be an option somewhere to enable Passthru.

Jun 23, 2010 Error 711: Cannot load the Remote Access Connection Feb 28, 2017 VPN help: error 721, the remote computer did not respond Well according to the specs of that device, it supports VPN passthru. Have you found the option to enable this? Unfortunately I don't know the sonicwalls interface so I can't help you, but if it supports it there should be an option somewhere to enable Passthru.