HELP PLEASE the weirdest error 2013 / connection ?

[[EMAIL PROTECTED]]

Hi,

this is the weirdest error I have ever encountered.

We get an error 2013 lost connection when we try to connect via mysql to 
another machine having mysql on it as well.   The weird part is that when 
we change the IP address of the connecting machine to another service 
provider it works fine. The problem does not happen the other way around, 
and the machines have the exact same configuration and both machine's 
mysql's have been upgraded to have the exact same version when we ran out 
of options on how to solve this. We checked passwords/hosts/users 
etc...  It just does not make sense and we frankly ran out of options. 
Please help if you can. thanks

Stew