How to Renew Lync Mediation Certificate
- Connect to the Server and open Skype for business server deployment wizard as administrator

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Click on Yes

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Now click on install or update Skype for business server system

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Now click on Step 3: Request , Install or Assign certificate

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Click on Request

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Put a friendly name and click on Next

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Now again click on Next

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Now again click on Next

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Now Click on Finish

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It will open a certificate assignment click on Next

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Click on Next
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Click on Finish it will replace a new certificate with old one








