we are connecting some of our customers via some OVPN-Tunnels (about 250 clients).
Every client has its own local subnet with a webserver serving some data over the VPN-Tunnel (see network diagram).
The routing is done via OSPF (NBMA) = this is up and running!
External access to the the specified ports, is natted over the VPN-Tunnels to the right destination = this is up and running, but not always..
Sometimes the connection between the endpoints is established like in the follwing screenshot and data is traveling without problems: But sometimes the connection attemp is just hanging in a "TCP syn sent"-state (screenshot firewall: fw0): The same "TCP syn sent"-state is on the other end of the tunnel (screenshot firewall: fw1):
Could this be a bug, or is this behaviour "normal" when tunneling data over OVPN-TCP?
I'm going crazy..
Thanks in advance!
