Issue
Invalid session handle or a session error. Make sure that sessions are begun and ended in pairs, and are always part of an explicit transaction.
Environment
LNS
LonMaker
Vista
NL220
Cause
If two LNS clients attempt to perform a device application download at the same time, one of the clients will receive the NS #36 SRSTS_SESSION_ERROR (Invalid session handle or a session error) exception.
Resolution
Retry the device application download at a later time.