I found error on my Mailbox server and can't find any description for this error:

Every 15 minutes I have a warning message EventId 1035 from MSExchangeFrontEndTransport.

Inbound authentication failed with error LogonDenied for Receive connector Client Frontend <ServerName>. The authentication mechanism is Login. The source IP address of the client who tried to authenticate to Microsoft Exchange is [127.0.0.1].

Any suggestion what it is can be?

• Edited by Kuzmin,Anton Wednesday, June 03, 2015 12:15 PM

Hi,

Please enable Protocol logging for this client Frontend receive connector, then check if there are any Authentication failed in Protocol log.

https://technet.microsoft.com/en-us/library/bb124531%28v=exchg.150%29.aspx?f=255&MSPPError=-2147217396

Best Regards.