Hi, Ubuntu 16.03, ISPConfig 3.1.7p1, ufw as firewall. At first no configuration of the firewall had any effect. Suddenly the machine crashed and after reboot it didn't respond to http/ssh/whatever any more. With the console I could open some ports in ufw directly. I did notice that ufw and iptables showed a very different configuration. After that I managed to make ISPConfig control ufw with a trick I found in this forum (remove most ports in ISPConfig, disable ufw, re-add the original porst and enable ufw). Now the problem remains that adding custom ports has no effect. If I remove or re-add port 21 for example the configuration of ufw reflects the change (ufw status numbered). I need to add port 8983 which is the default port of Apache Solr. But adding it to the list in the Firewall record has completely no effect. What do I need to do to open this port? Thanks in advance for your effort.