I was using Webmin and it told me a newer version was available, so I clicked the button to install it. No errors, except when it finished, the following error appeared in the Firefox browser:
Secure Connection Failed
An error occurred during a connection to server.example.com:10000. Cannot communicate securely with peer: no common encryption algorithm(s). Error code: SSL_ERROR_NO_CYPHER_OVERLAP
The page you are trying to view cannot be shown because the authenticity of the received data could not be verified.
Please contact the website owners to inform them of this problem.
Internet Explorer gives me this error:
This page can’t be displayed
Turn on TLS 1.0, TLS 1.1, and TLS 1.2 in Advanced settings and try connecting to https://server.example.com:10000 again. If this error persists, it is possible that this site uses an unsupported protocol or cipher suite such as RC4 (link for the details), which is not considered secure. Please contact your site administrator.
Usermin continues to work on port 20000. The virtualmin command line still works. I tried deleting the stored certificate in the browser, but still does not work. The options in Firefox to override this error also do not work. A search of the internet says that Webmin may be using RC4 protocol, which is obsolete.
I am the "site administrator" and do not know what to do here. Thanks.