Error during Exchange 2013 CU upgrade from CU20 to CU22 – “The installation source for this product is not available. Verify that the source exists and that you can access it”
![Exchange server 2013 recovery installation failure | [ERROR] The internal transport certificate for the local server was damaged or missing in Active Directory | Anish Sam Johnes](https://anishjohnes.files.wordpress.com/2021/03/new1.png "Exchange server 2013 recovery installation failure | [ERROR] The internal transport certificate for the local server was damaged or missing in Active Directory | Anish Sam Johnes")
Exchange server 2013 recovery installation failure | [ERROR] The internal transport certificate for the local server was damaged or missing in Active Directory | Anish Sam Johnes
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Error during Exchange 2013 CU upgrade from CU20 to CU22 – “The installation source for this product is not available. Verify that the source exists and that you can access it”
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![Exchange server 2013 recovery installation failure | [ERROR] The internal transport certificate for the local server was damaged or missing in Active Directory | Anish Sam Johnes](https://anishjohnes.files.wordpress.com/2021/03/sync.png?w=918 "Exchange server 2013 recovery installation failure | [ERROR] The internal transport certificate for the local server was damaged or missing in Active Directory | Anish Sam Johnes")