Follow these guidelines to resolve the problem:
Ensure that you are using an appropriate bookmark or the correct URL to access the Control Center. An incorrect URL or bookmark causes the "Page cannot be displayed" error. For additional information, click the following solution ID:
SO2076 Error: "The page cannot be displayed" or "Managed PKI Error / Server Error.." when trying to access the Control Center using a bookmark
Ensure that you logged into the proper domain. An incorrect domain causes the "Error 500: Internal Server Error" error. For additional information, click the following solution ID:
SO3732 Error: ''The page cannot be displayed'' when trying to access the Control Center from another domain
Ensure that you recover your private key if you changed your password in Microsoft Windows XP. An unrecovered private key causes the "Page cannot be displayed" error. For additional information, click the following solution ID:
SO787 Error: "The page cannot be displayed" when accessing the Control Center after changing your password in Microsoft Windows XP
Ensure that you are using a valid Administrator ID. A revoked, expired, or incorrect Administrator ID causes the "3a0e" error. For additional information, click the following solution ID:
SO4118 Error: "3a0e" when trying to access the Control Center with an invalid Administrator ID
Verify if the Certificate Authority (CA) certificate has expired. An expired CA certificate causes the "3a0e" error. For additional information, click the following solution ID:
SO7153 Error: "3a0e" when trying to access the Managed PKI Control Center