I have a very tiny network in one room, with one Fedora laptop connected to a Dell PowerEdge server with CentOS. They communicate through an unmanaged wired Ethernet switch, which itself is connected to an AC1750 router that acts as a bridge to the pre-existing WiFi. The server has a static IP, everything else is dynamic.
I got SSH and Telnet to work between the client laptop and the server, then 45 minutes later, neither work again (connection timeout). The WiFi bridge is fine, otherwise I wouldn't be posting this with the laptop right now.
ssh localhost also works just fine on the server. Oh, and pinging works too.
Any suggestions or theories why SSH would just die an hour after working?