Webmail not working through ADSL router ?

[Unwell Cat]

I have one of these from Overclockers -

Dynamode R-ADSL-C4WEG 54Mbps Wireless ADSL2+ Modem/Router/Switch/Firewall (NW-000-DN)

Basically any webmail ( Hotmail, Yahoo etc ) does not work through it. You get the login page, input user credentials and press login, the page refreshes and displays the login page once more.

If I change the router it works fine..!! Can someone please help me out.
I'm not aware of any ports I need to open to allow webmail, certainly on the other routers ( Netgear, Dlink ) that work no particular ports are open.

Thanks

 

[Unwell Cat]

On AOL by any chance?

No mate, it's freeserve. It's not the ISP as I have tried the router with both Freeserve and Zen ADSL providers with the same result. If I change the router voila webmail works fine.

C'mon guys any other suggestions ?