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CRM Emails to Exchange EWS Directory Fails via the LoadMaster

 

Information

 

Summary:

This article covers how to resolve the issue when CRM emails to Microsoft Exchange EWS fail via the LoadMaster.

Environment:

Product: LoadMaster

Version: Any

Platform: Any

Application: Any

Question/Problem Description:

Facing an issue where emails sent from the CRM application server to the Microsoft Exchange EWS would fail when the request was via the LoadMaster but it would work when bypassing the LoadMaster.

Steps to Reproduce:  
Error Message: "The underlying connection was closed: An unexpected error occurred on a send". Note: This message was seen on the CRM application logs. 
Defect Number:  
Enhancement Number:  
Cause: The Microsoft EWS directory requires to see the client's IP address. 
Resolution:

The Virtual Service (VS) in this case need to be a transparent passthrough service. Transparent means the LoadMaster will use the client IP address when forwarding the request to the real server (RS). Passthrough means that the SSL/TLS traffic should not be offloaded on the LoadMaster and should be handled by the RS (see screenshot). 

SSL Passthrough.png

For more information on how to configure a transparent VS and the requirements that must be met in order for the set-up to work, please review this article Transparency.

Sometimes transparency may not be possible for the environment due to the requirements that must be met. Direct Server Return (DSR) could also be used instead. For more information on how to configure DSR, please review this article Configuring DSR

Workaround:  
Notes:

https://support.kemptechnologies.com/hc/en-us/articles/14337502169357

https://support.kemptechnologies.com/hc/en-us/articles/14337600667021-Configuring-DSR 


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