A general system error occurred: HTTP request error: cannot authenticate SSL certificate for host <publisher_vcenter_fqdn>.
InternalServerError (com.vmware.vapi.std.errors.internal_server_error) =>
{messages = [LocalizableMessage (com.vmware.vapi.std.localizable_message) => {id = vapi.bindings.method.impl.unexpected,defaultMessage = Provider method implementation threw unexpected exception: com.vmware.vapi.std.errors.InternalServerError,args = [com.vmware.vapi.std.errors.InternalServerError],params = <null>,localized = <null>}, LocalizableMessage (com.vmware.vapi.std.localizable_message) => {id = com.vmware.vdcs.cls-main.http_request_error_peer_not_authenticated,defaultMessage = HTTP request error: cannot authenticate SSL certificate for host <publisher_vcenter_fqdn>,args = [<publisher_vcenter_fqdn>],params = <null>,localized = <null>}],data = <null>,errorType = INTERNAL_SERVER_ERROR}
Azure VMware Solution (AVS)
The Content Library synchronization failure is caused by a thumbprint mismatch between the publisher and subscriber vCenter instances.
The mismatch is caused by AVS vCenter having the incorrect/old certificate information for the VCSA.
For information regarding AVS support, refer : Getting Support for Azure VMware Solution (AVS)