asio.ssl error on RStudio Server

We have errors in /var/log/messages:

Feb 15 10:34:17 spch0388 rsession-u105918[3996]: ERROR asio.ssl error 336134278 (certificate verify failed); OCCURRED AT void rstudio::core::http::TcpIpAsyncClientSsl::handleHandshake(const rstudio_boost::system::error_code&) src/cpp/core/SocketRpc.cpp:177; LOGGED FROM: void rstudio::monitor::{anonymous}::logErrorHandler(const rstudio::core::Error&) src/cpp/monitor/MonitorClientOverlay.cpp:61

Environment:

• RStudio Server Pro: Version 1.3.1073-1
• Red Hat Enterprise Linux Server release 7.7 (Maipo)
• Openssl: Version 1.0.2k Release 19.el7
• Client Browser: Microsoft Edge: Version 88.0.705.63 (Offizielles Build) (64-Bit)

Although this error message occurs, the scientists can work without problems.

Do you have a hint what the problem is?

Thanks for your support
Reto Iten