Abstract: If you check your Skype for Business frontend server event log you see multiple warnings for the Windows Fabric related to the cert chain trust and the certificate revocation list (CRL).
- Certificate Revocation List File
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Re: Disable Certificate Revocation List Aug 21, 2007 10:34 AM improwise LINK I spoke with a guy a Microsoft and he confirmed that it wasn't possible to disable the exipration check, to bad. For each CA, we include Uniform Resource Identifiers (URIs) to download the associated Authority Information Access (AIA) and the Certificate Revocation List Distribution Point (CDP) files. When appropriate, we also provide a URI to the Online Certificate Status Protocol (OCSP) endpoint. CAs used in Azure Public and Azure US Government clouds.
Certificate Revocation List File
Pdf architect 4 download. The errors in the event log show up similar like the following:
As 0x1000040 implies:
#define CERT_TRUST_REVOCATION_STATUS_UNKNOWN 0x00000040
The first line above is nearly the same as the 2nd line. This lead to the following solution:
The error show up if the CRL, which is specified in the SSL certificates you are using on your Skype for Business (=SfB) environment, couldn´t be reachable from your SfB frontend server. This could be due to a firewall issue (e.g. needed port isn´t open) or a proxy exclusion list isn´t set via 'netsh winhttp set proxy'. Once the server can reach the CRL again the problem should be solved.
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To find the CRL you could open the SSL certificate and check the 'CRL Distribution Point' property for more details.
Keep noted that most Skype for business (aka Lync) server use a certificate from an internal Microsoft certificate autority (MS CA). So do not check only the external CRL for the public certificate you are using, check also the internal CRL!
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