Weird problem, only one port, 80, is blocked.

Hi there,

This started last Friday, incoming ADSL traffic on port 80 stopped.
So I contact the ISP and they say there's no block, after some days
today we find they can get to my port 80 only from the same CIDR
block (123.2.0.0/15).

What could cause this? The ISP are clueless.

I added port 8080 for the web server and that works, as does ftp
and other low port protocols. But the normal hits from search
engines and the odd visitor has completely stopped.

The ADSL modem is bridged to linux box, so it's not a forwarding
issue, plus I bypassed some existing iptables firewall rules with
new rules for 80 + 8080 so they follow same path.

Thanks,
Grant.
--
http://bugsplatter.id.au/
.

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