Hi About your question, the RTC service need the read/write permission to the OCS SQL database. You can get some more information from below link http://technet.microsoft.com/en-us/library/dd425291(office.13).aspx According to your issue, the issue may be caused by other thing, for example: 1. Ensure that you use a strong password that meets your organization’s Active Directory password requirements. 2. Ensure that all my RTC service accounts passwords had expired. 3. Ensure that the certificates on the web components server was configured correctly. 4. Ensure that the permission for the share folders was configured correctly.