I have a pc setup as a web-server behind a zyxel router. I have port 80 forwarded and all works well - most of the time.
Occasionally, instead of the default web-page, users are presented with the router login page - sometimes after being 'kicked-out' of the web-page they were on (after clicking a link etc.).
For reference, I previously had an issue with users not being able to use the public ip address to access the site when on the local lan so I added 2 entries to the hosts file, same name but with local ip first, then public ip second. This has been working fine for 2 years(ish).
It's defintely only happened since the zyxel was installed to replace old BT router but it seems to be happening more frequently. Users generally re-try a few times and the correct web-page appears but it's very inconvenient as you can imagine.
Before I post any specific details, any ideas would be most appreciated.