InvalidOperationException When calling web service

[Oleg]

Hi Folks,

I am getting this error:

InvalidOperationException: Request format is unrecognized

while calling my web service. I don't get it if I call it
from the localhost machine, just from outside.

The web service has been built using .Net Framework 1.0
and it worked fine for half a year.
I converted it into VS 2003 and .Net Framework 1.1 and
it stopped functioning.

Any ideas?

Oleg