Hello Mathew,yes, we have two on-prem ThreatGrid.The problem has been solved. We have rebooted the thread grid on which we have renewed the certificate. After restarting the machine the connection worked.Thanks for your help.Best regardsMarcus 

Hello Mathew,we have installed the following version on the ESA:Product: Cisco C600V Secure Email Gateway VirtualModel: C600VVersion: 16.0.1-019The Telnet connection works perfectly.On Monday, we renewed the SSL certificate in the Threat Grid under C...