LT2P VPN connection issues
I'm using Windows LTP/VPN (2019). The watchguard firewall has the appropriate ports (and more) open (500,1701,1723,4500,GRE,ESP,AH).
There's an issue with the VPN connections. I am able to connect to the VPN if I'm the first users. When subsequent users connect, I am unable to ping the VPN sever's local IP (10.x.x.x) through the VPN for about 30 seconds and neither is the 2nd VPN user. After the 30 seconds both clients pings start receiving replies from the pings.
When I try to connect with an Android phone that timeout period is long enough that the connection fails.
I setup the VPN exactly the same as other locations that are working. The only difference is the watchguard firewall. Does anyone know of a setting or issue on the Watchguard that could be the cause?