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Thanks for both experts in recommending the article that leads to problem solving. At the end, creating a new receive connector solved the problem.
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Thanks for both experts in recommending the article that leads to problem solving. At the end, creating a new receive connector solved the problem.

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Glad to know it is fixed and thanks for sharing your solution<br />
Please select your comment as accepted solution as it will help others in future
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Glad to know it is fixed and thanks for sharing your solution
Please select your comment as accepted solution as it will help others in future

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This is using MS Exchange 2010 server. However, recently found &nbsp;lots of the same warning event as follows:<br />
<br />
EventID: 1035<br />
Source: Ms Exchange Transport<br />
Task Category: SMTPReceive<br />
<br />
Description:<br />
Inbound authentication failed with error: Logondenied for authentication on receive connector Default ABC. The authentication mechanism is login. The source ip address of the client who tried to authenticate is {xx.xx.xx.xx}.<br />
<br />
What went wrong and how to troubleshoot?<br />
<br />
thanks in advance.
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This is using MS Exchange 2010 server. However, recently found  lots of the same warning event as follows:

EventID: 1035
Source: Ms Exchange Transport
Task Category: SMTPReceive

Description:
Inbound authentication failed with error: Logondenied for authentication on receive connector Default ABC. The authentication mechanism is login. The source ip address of the client who tried to authenticate is {xx.xx.xx.xx}.

What went wrong and how to troubleshoot?

thanks in advance.

Receive these warning on the Exchange server, what went wrong?

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.