'Caller was not authenticated by service' error during sync after disabling TLS 1.0 Last Modified: 10/18/2016 Applies to version(s): 9.1 SP19.19.0 SP39.0 SP29.0 SP19.08.7 SP28.7 SP18.78.618.60 SP18.608.5 SP38.5 SP28.5 SP18.5 Expand All | Collapse All Description If you are receiving the below error during eSync check to see if TLS 1.0 is disabled on the server. The caller was not authenticated by the service. Error executing strategy 'OnAfterESyncRunErrorFromPeer' remotely. Type 'System.ServiceModel.Channels.ReceivedFault' in Assembly 'System.ServiceModel, Version=188.8.131.52, Culture=neutral' is not marked as serializable. Cause Resolution See the following KB with more information on this issue and which version it is fixed in. https://portal.ektron.com/KB/10696/ Other Resources Tagged In ProblemEsync Related Articles Feedback This article has not been rated.