How can I open a port in Kubuntu 19.10?

My application works by accessing a port. In Ubuntu 18.10, it used to automatically assign to the specific port. Now I have upgraded to Kubuntu 19.10 and whichever port I am mentioning in the application.properties, I get the below message: ************************** APPLICATION FAILED TO START *************************** Description: The Tomcat connector configured to listen on port…

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First ethernet port on Ubuntu Server 18.04.3 LTS suddenly refuses to connect to vpn router on startup. Second port connects correctly

I have a Netgear Prosafe FVS336GV2 and a Dell Poweredge R540. The prosafe is obviously ancient, but the Poweredge I set up about a month ago. Until this weekend, it was working fine. I have the Prosafe set up to create an internal network with a few machines, none of which are experiencing issues. The…

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