I had a certificate installed in Exchange 2007. Everything was working well. I needed to remove it and replace it with an updated one. Which I did, but when I go to enable the certificate, I get the following error: [PS] C:\Windows\System32>enable-exchangecertificate -thumbprint 94C4DBC666642FC8A16762EBC2700237A4C8B9B5 -services "iis" Enable-ExchangeCertificate : An unexpected error occurred while the forms-based authentication settings for path /LM/W3SVC/1 were being modified. The error returned was 5506.At line:1 char:27+ enable-exchangecertificate <<<< -thumbprint 94C4DBC666642FC8A16762EBC2700237A4C8B9B5 -services "iis" I do not have a clue what to do. I have searched google high and low and appear to be the only one suffering from this issue. I have tried reinstalling IIS to no avail. I really do not wish to have to remove and redeploy exchange. Does anyone know what may be happening?

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Hello,i had exactly the same problem. In my case, it helped removing, re-importing and re-nabling the certificate.