I have a DMZ set up with a Raspi providing an XMPP server called Openfire.
The admin console is a webinterface on port 9090 and 9091, also ssh on port 22 is reachable.
But from time to time when I am in the webinterface I get timeout messages from browser. This lasts sometimes shorter sometimes longer until it works again. During this time I can’t connect to ssh either, but if I’m already connected it continues to work.
What I noticed is that the Ipfire in the time also can not make whois requests.
Does anyone have an idea what this could be?
The Raspy is not overloaded, firewall rules do not bring any changes, because the connections work, but after a while then always these timeouts