Error contacting server

Since 1 week on our VPS we staretd to have big problems with server shutting down… all ports listed here are OPEN

Windows Server 2019 with Windows Firewall

2021-03-13 19:27:17.277997|ERROR |Accounting | |Error contacting server SSL_ERROR: Alert on protocol: TLS 1.2 level: fatal error: unsupported_certificate (43)
2021-03-13 19:27:21.121491|ERROR |Accounting | |Error contacting server RESOLVE_ERROR: No such host is known
2021-03-13 21:27:16.206949|ERROR |Accounting | |Could not connect to accounting server after multiple attempts, shutting down server

A post was merged into an existing topic: Server Stops after a failing connection with the Accounting Server