@David-TP So it turned out that the problem was in Ubuntu related to the Netplan configuratoin files. Basically my fixed IP was being replaced by a DHCP allocation. I removed the offending settings...

@David-TP yes. I replied on the other thread.

@David-TP I've set up a new mailserver with iRedMail which works for about 2 minutes then loses connection with the server. The server is a linux box on my network. I'm replacing an instllation of...

In the background information page on firewalls <https://community.tp-link.com/en/home/stories/detail/255> TP_TechWriter describes the Firewalls and comments that SPI is enabled by default, and DoS...

I have a mailserver in my network and a fixed IP. The ports on the server report that they are listening, but another machine on the internal network reports (through nmap) that the host is down. I...