Wednesday , August 12 2020

Certificate is invalid and revocation check failure in Exchange Server

When you import a certificate from a certificate authority . It checks the revocation status of an SSL Certificate, the client connects to the URLs and downloads the CA’s CRLs. Then, the client searches through the CRL for the serial number of the certificate to make sure that it hasn’t been revoked.

but when exchange servers has internet. It will not have any issues. But when its behind the proxy. it may not have issues if your proxy is configured through .use automatic detect settings.

As it uses the system account  –  System account has its own proxy settings – Lets see how to access the systems account proxy settings.



Revocation Check failure


To check your CRL urls – Use internet explorer – Security lock – view certificates

Solution –

Download Sysinternals to check the system proxy settings

Get PsExec.exe into a folder. browse to command prompt.


PsExec.exe –i –d –s cmd

run whoami make sure you are in system account proxy settings

inetcpl.cpl to access system proxy settings

So that we can change the win http proxy settings of the system.


Entered my proxy settings. Click ok.


Reboot the server.

Certificate is valid now.


About Satheshwaran Manoharan

Satheshwaran Manoharan is an Microsoft Office Server and Services MVP , Publisher of Specialized in Office365 / Microsoft Exchange / Virtualization , Sathesh is an Messaging Expert supporting/Designing/Deploying many medium size businesses to large enterprises when it comes to Corporate messaging and Virtualization Infrastructure

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