My provider told me that nothing was changed in there network or policy.
In my DNS any request for my domain is forwarded to some other port (21321). This port is open on my router and with a redirscript on the server this same portnumber is tranlated to port 80.
At this moment my site is working. But if I want to use webmail I have to alter the URL to go to port 443.
I'm not sure why this workaround works.
In my opinion it can be because the ISP is blocking port 80, although they say they don't. Or I have an error with port 80 on the server.
If I request my external IP-address in a webbrowser I stil have a timeout. Only requests for
www.mydomainname.com can view my homepage.
All other traffic (ports) have no problem at al.
Anybody a hint?