What certificate do I need to install to get OCS to work on non-domain joined computer?

Posted on 2014-08-25
Last Modified: 2014-08-26
I've got a non-domain joined laptop that I need to get Office Communicator 2007 R2 working on.  The server is OCS 2007 R2 and the Laptop is Windows 8.1.  When I try to sign in to communicator I get the following error.

There was a problem verifying the certificate from the server. Please contact your administrator.

I am sure this is because there is a cert that I need to install that would normally be in place if the computer was on the domain.  

My questions is what certificate do I need to install on the laptop?  And will it be on the OCS server or on a domain controller?

Question by:Randy Knight, MCM
    LVL 77

    Expert Comment

    by:David Johnson, CD, MVP
    how many front end servers do you have?

        FQDN OCS pool =
        FQDN OCS Front End Servers
    To correctly request certificates for both front servers enter the following -
        Certificate name =
        Certificate subject alternative names include -
            DNS or
    LVL 20

    Accepted Solution

    Guessing that the certificate on OCS is enrolled from an internal PKI - you need to install the internal PKIs trusted root certificate on all non-domain PCs connecting to OCS (from LAN).

    Log on to OCS server - go to certificates snap-in - computer certs. Find the OCS cert in use - go to certification path - select root certificate and click open/view - and then COPY TO FILE to export this certificate. Then import to COMPUTER STORE (important!) in Trusted Root Certification Authorities, on the non-domain PCS.

    This makes your non-domain PC trust the certificate for the OCS server

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