The issue impacts only “Endpoint Security VPN” flavor of standalone VPN clients which contains firewall module. CFirewallWrapper::InitFirewallMonitor: waiting for vsmon initialization failed Affected versionsĮndpoint Security VPN, versions E86.60 and E86.70 WaitForServiceStart: OpenService('vsmon') failed: The specified service does not exist as an installed service. In addition, following lines can be found in trac.log: CFirewallWrapper::InitFirewallMonitor: ERROR - lpFwMonitor_Start failed, try to wait for the service initialization Validity period of this certificate ended on April 8, 2023, VPN client became unable to initiate firewall module and failed with error “Connectivity with VPN Service is lost”.

The issue happened due to expiration of certificate which was used for signing firewall driver vsdatant.sys.