Strange ODBC error.Any Clue?

Hi,

When I tried to connect to an ODBC connection thru agent I got the following error.

APPC Primary RC = Parameter_Check; Secondary RC = Bad_LU_Alias.

Any idea what this means?. The problem is now resolved by refreshing the connection.But we not know what the above error means or why we had it. Any information is helpful.

Thanks,

Padma