Dear Experts,
We using MS TMG server as our VPN server, it already working for 3 years.
But from 7 days ago, we found a very strange problem that VPN clients cannot access internal network although VPN connected.
As checking the route table of TMG server, we found all routing entries for VPN clients lost when the problem happened.
For example, we set VPN client IP range in TMG is 10.212.226.1 ~ 10.212.226.250, with 5 clients have VPN connected with TMG server, normal situation the routing entries should be like this:
10.212.226.1 255.255.255.255 On-link 10.212.226.1 277
10.212.226.6 255.255.255.255 10.212.226.6 10.212.226.1 22
10.212.226.7 255.255.255.255 10.212.226.7 10.212.226.1 22
10.212.226.11 255.255.255.255 10.212.226.11 10.212.226.1 22
10.212.226.14 255.255.255.255 10.212.226.14 10.212.226.1 22
10.212.226.18 255.255.255.255 10.212.226.18 10.212.226.1 22
With above routing table, all 5 VPN clients working fine, they can access internal network. But once the problem happened, then only below one VPN routing entry can find in routing table, others are all missing.
10.212.226.1 255.255.255.255 On-link 10.212.226.1 306
At this moment, all VPN clients cannot access internal network although they still connected. This problem can be solved after a server reboot. But it would happen after several days.
Looking for your support and feedback. Thank you very much.
Best regards,
Jiali Feng