Dear List, I followed the thread "RE: InvalidStateError: Failed to set remote answer sdp: Called in wrong state: kStable". Alain DEVILLE talked about this problem he had with opening up ports 49152:65535/udp for incoming and outgoing traffic.
On Ubuntu 18.04 LTS I installed ufw to set up a firewall. ufw status verbose gives: 22 ALLOW IN Anywhere 3478/tcp ALLOW IN Anywhere 3478/udp ALLOW IN Anywhere 5443/tcp ALLOW IN Anywhere 8888/tcp ALLOW IN Anywhere 49152:65535/udp ALLOW IN Anywhere 22 (v6) ALLOW IN Anywhere (v6) 3478/tcp (v6) ALLOW IN Anywhere (v6) 3478/udp (v6) ALLOW IN Anywhere (v6) 5443/tcp (v6) ALLOW IN Anywhere (v6) 8888/tcp (v6) ALLOW IN Anywhere (v6) 49152:65535/udp (v6) ALLOW IN Anywhere (v6) 49152:65535/udp ALLOW OUT Anywhere 49152:65535/udp (v6) ALLOW OUT Anywhere (v6) So I believe they are open. Using telnet myserver 49152 gives a "trying myserver" until there is a timeout. Disabling ufw and telneting again says: Trying myserver... telnet: connect to address myserver: Connection refused Thus the firewall rules make a difference. Using sudo nmap -sU -p 49152 myserver PORT STATE SERVICE 49152/udp closed unknown even if I enabled ufw firewall This contradicts the telnet result doesn't it ? The "kStable ....." error still shows up from time to time .... My questions: 1) How can I test for open ports49152:65535 and be sure about the result? 2) My Provider is Strato. Do I have to contact the provider to open up the ports for incoming and outgoing udp packages ? 3) Are my firewall rules correct? I did not manage to find instructions on installing the pure iptables alternative on ubuntu 18.04. I've tried to implement the stuff from the ALVARO-manual about SSL. This time using ufw. Many thanks .... kaffeesurrogat ....
