Webinterface on WNR3500L disappeared

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hakelm's picture
Webinterface on WNR3500L disappeared

I have a 4 year old Netgear WNR3500L that until today has worked flawlessly.

Now port 80 has disappeared. The router still works but I can't manage it. I have rebooted the machine several times but to no avail.

Nmap gives me:

Starting Nmap 7.01 ( https://nmap.org ) at 2017-06-18 10:41 CEST
Nmap scan report for
Host is up (0.0044s latency).
Not shown: 997 closed ports
21/tcp   open  ftp
53/tcp   open  domain
5000/tcp open  upnp
MAC Address: 20:E5:2A:05:0D:D2 (Netgear)
Any tip on how to fix this will be highly appreciated.