I recently had a customer who continuously saw events with Event IDs 41026 and 41024 logged on their front end server. The description of both of these events stated “Lost Connection to all Web Conferencing Edge Services. I initially tried the resolution steps outlined in Ståle Hansen’s blog post discussing this error. None of these seemed to work. I resorted to looking at trace logs and found the error “Certificate did not match any of the supplied FQDNs”. This pointed me in the right direction. After reviewing the certificates I found that both the internal edge interface and the front end server had certificates from the internal PKI, however the internal edge interface had a certificate from a subordinate CA while the front end had a certificate from the root CA. The front end had no knowledge of the chain for the certificate issued from the subordinate CA thus didn’t trust the certificate being presented by the internal interface of the edge server. I reissued the front end certificate from the subordinate CA and both errors stopped. Issue resolved.