I have a site to site VPN set up with a vendor. I can hit the remote servers consistently for about 2 weeks, and then all new connection attempts time out. No ping, no http, nothing. If I go into my firewall config and turn off the VPN and then turn it back on, the connections begin working again.
I have a number of other VPNs set up that don't have this problem, so I'm thinking this is either an issue with the remote server and/or firewall. What things should I try to fix this?