I can't figure out what causes this error.

I can "fix" it by regenerating the server key on the system I'm trying 
to connect to and restarting sshd but that seems to be temporary as the 
same problem comes back in a week or so.  Rebooting the server does not 
fix it.

Does anyone know what that error means?  I am using ssh not gsissh 
although I do have globus toolkit installed to contact grid computers.

I'm pretty sure it's a misconfiguration on my part but I can't figure 
out what I did or didn't do.

Thanks,

Joe