Warning: The Chain Certifcate is Invalid during installing Lync Server

Problem

During install Lync Front End Server, I have following error during Request Certificate

WARNING: The chain of the certificate “” is invalid.

WARNING: “Request-CSCertificate” processing has completed with warnings. “1″ warnings were recorded during this run.

WARNING: Detailed Results can be found at””

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Solution

This issue happened because you didn’t have Root Certificate (AD Certificate) in  your Trusted Root Certification Authorities list

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To import Root Certificate (AD Certificate), you can follow below steps:

  1. Go to certificate request website “http://dc.domain.local/certsrv”  and Click “Download a CA certificate, certificate chain, or CRL
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  3. Click “Download CA certificate chain
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  5.  Go to Run > mmc > File > Add/Remove Snap-in > Certificates > Computer Account > Trusted Root Certification Authorities > Right Click > Certificates > All Tasks > Import
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  7. Import AD certificate file which you are download from portal into your Trusted Root Certification Authorities list
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  9. Problem now is solved after certificate imported as below

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