Outlook web access 500 error after login

[smalls001]

Hi all,

Hope someone can help, it's doing my head in !!!!

The school has got exchange 2003 and ISA 2004.

The problem is OWA to externally access. The web address is https://FQDN/exchange gets the owa form login box, but when I enter my username and password it 'The page cannot be displayed' The technical exploration is

'Error Code: 500 Internal Server Error. The token supplied to the function is invalid (-2146893048).

It all works fine interally https://servername/exchange.

On the ISA server I get a 'failed connection Attempt' on TCP Https 443


Hope someone can help !!


Thanks in Advanced !!

[smalls001]

*bump*