Thanks for the replies. I've tried everything...
Turn off DHCP, set static IP/DNS info
- Browsing web works, but many sites timeout or load veeeery slowly
Turn off every feature possible: firewall, dmz, advanced dns, dns relay, wireless, everything...
- Same symptoms
With DNS relay off, set DNS to ISP's DNS servers
- Same symptoms
Windows firewall off, no ZA
- Same...
Setting primary DNS to router IP, secondary to ISP DNS IP
- Same...
Feels hopeless you know? ;/