I've just deployed Skype for Business Server 2015 in my domain but I get the following in my event log persistently.
1) 1e5880b0: ignore error 0x80092013:certificate revocation list offline
2) 1f8da773d0: cert chain trust status is in error: 0x1000040
All my clients work fine, and I've verified my certificate is perfectly valid with a good chain.
I've found a Russian MSDN post with the same problem.
https://social.technet.microsoft.com/Forums/ru-RU/0e654e98-2633-4bc3-b32a-222fb5f32895/-lync-2013-skype-for-business-event-4097?forum=lync2013ru
Anyone any ideas?