I have been using Gitlab without problems for a couple of months now. But, since yesterday, I can not \"reach\" (fetch, push,...) Gitlab from my Eclipse IDE anymore.
No
I've encountered a similar error with another Gitlab server. I dug into it and discovered that all of the available ciphers on the server were at least 256 bits. Standard Oracle Java ships with crypto that's restricted to 128 bits for some algorithms. After installing the unlimited strength crypto package from Oracle the issue went away.
Almost forgot, the unlimited strength package is only legally available in the US. If you're outside of the US then I think that OpenJDK will work instead.