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How do I resolve Exchange certificate status says “Invalid” or Revocation check failed”?

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For certificate status “Invalid”:

Make sure the certificate is installed with the private key.

If the private key is missing you can attempt to recover or re-issue the certificate:

/articles/en_US/Technote/What-are-the-steps-to-recover-the-private-key-of-an-SSL-certificate-in-an-IIS-environment

Make sure that the certificate chain/intermediate and Root certificates are installed.

For certificate status “Revocation check failed”:

Make sure to whitelist the FQDN names for Certificate revocation checking:

/articles/en_US/Technote/IP-Range-for-Entrust-Revocation-CRLOCSP

If you are using proxy server then configure proxy bypass list as per following Microsoft KB:

https://support.microsoft.com/en-us/kb/979694

If you have any questions or concerns please contact the Entrust Certificate Services Support department for further assistance:

Hours of Operation:
Sunday 8:00 PM ET to Friday 8:00 PM ET
North America (toll free): 1-866-267-9297
Outside North America: 1-613-270-2680 (or see the list below)
NOTE: Smart Phone users may use the 1-800 numbers shown in the table below.
Otherwise, it is very important that international callers dial the UITF format exactly as indicated. Do not dial an extra "1" before the "800" or your call will not be accepted as an UITF toll free call.

Number
オーストラリア 0011 - 800-3687-7863
1-800-767-513
オーストリア 00 - 800-3687-7863
ベルギー 00 - 800-3687-7863
デンマーク 00 - 800-3687-7863
フィンランド 990 - 800-3687-7863 (Telecom Finland)
00 - 800-3687-7863 (Finnet)
フランス 00 - 800-3687-7863
ドイツ 00 - 800-3687-7863
香港 001 - 800-3687-7863 (Voice)
002 - 800-3687-7863 (Fax)
アイルランド 00 - 800-3687-7863
イスラエル 014 - 800-3687-7863
イタリア 00 - 800-3687-7863
日本 001 - 800-3687-7863 (KDD)
004 - 800-3687-7863 (ITJ)
0061 - 800-3687-7863 (IDC)
Korea 001 - 800-3687-7863 (Korea Telecom)
002 - 800-3687-7863 (Dacom)
マレーシア 00 - 800-3687-7863
オランダ 00 - 800-3687-7863
ニュージーランド 00 - 800-3687-7863
0800-4413101
ノルウェー 00 - 800-3687-7863
シンガポール 001 - 800-3687-7863
スペイン 00 - 800-3687-7863
スウェーデン 00 - 800-3687-7863 (Telia)
00 - 800-3687-7863 (Tele2)
スイス 00 - 800-3687-7863
台湾 00 - 800-3687-7863
英国 00 - 800-3687-7863
0800 121 6078
+44 (0) 118 953 3088