SolidCP does not work with TLS 1.2. It seems to be using older SSL or TLS 1.0 or TLS 1.1 ciphers.
Can you please add support for TLS 1.2 and TLS 1.3 in the future?
chris Unselected an answer
Upon further testing, confirming SolidCP only works with external servers and TLS 1.0 enabled on that server.
It does work with TLS 1.1 or TLS 1.2 enabled on the external server.
Sorry I should have been more clear on my initial post.
chris Edited answer