Exchange 200X - Error Inbound authentication failed with error UnexpectedExchangeAuthBlob for Receive connector Default The authentication mechanism is ExchangeAuth. The source IP address of the client who tried to authenticate to Microsoft Exchange is 192.168.X.X



In a corporation with different Exchange server 200X/2010 had a problem to send email through relative connector.

In the destination Exchange Server I found the following Error:

Inbound authentication failed with error UnexpectedExchangeAuthBlob for Receive connector Default The authentication mechanism is ExchangeAuth. The source IP address of the client who tried to authenticate to Microsoft Exchange is 192.168.X.X

I found which is the problem.

The exchange Server and AD controller from the original site was 6 minutes late than PDC of the destination Exchange Site.

Changing the time and waiting some minutes the problem has been solved.

Here is the Microsoft Article that I have used.