previously install centos 5.5+ispconfig, also did not work in this. Now ubuntu 10.10+ispconfig installed was smoothly. Router port 80, 8080, 21,53,443 to server local ip. Domain name server add and no problem. ISPConfig panel access no problem (local network and other network). ISPConfig before adding a domain : dns tab > dns wizard > fill in the required fields after sites > add new website again fill in the required fields. Added site can not access. Verisign web site nameserver whois results my router ip no problem. Network-tools website nslook query results Name server failed. There are many topics about it in the forum, I looked but could not find a solution. I would be happy if you help. Thanks in advance.