Weird Salesforce Integration Error - INVALID SESSION ID


Not sure what is the cause of this error. I have had two within the past week for one client. Any insight from someone who understands this tech coding jargon?

1.Request Error: INVALID_SESSION_ID: Invalid Session ID found in SessionHeader: Illegal Session. Session not found, missing session key: 00D300000001FtM!AQIAQCFXFUu9Gcn.NTqrCtXlH0IaOYDeaX4_G8BfsdEzxy_xNXzQaOut7PgWoX0KTBwBlkPunOtP7K5ZBePI1y5Yu0opfpvI This is expected, it can happen if the session has expired and swept away, or if the user logs out, or if its just someone trying to hack in.


one case for this to happen is when the whatever systems attempts to login to Salesforce in very short time spans which results in the same session Id being issued.
So make sure that this does not happens.