Answer
A message was being processed but could not be delivered to the recipient for some reason. Therefore GMS has issued a protocol error and sent a DSN to the sender of the message saying that this message has not been delivered.
In this case, session Undefined was processing a connection from Undefined and is going to reject a message apparently from Undefined to Undefined. The protocol error was
Undefined
.
If this is the correct result, no action is required by you.
See Also:
Keywords:DSN non-delivery RFC1891 8282