To resolve Nessus Vulnerabilities
20007 SSL Version 2 and 3 Protocol Detection
42873 SSL Medium Strength Cipher Suites Supported
62565 Transport Layer Security (TLS) Protocol CRIME Vulnerability
94437 SSL 64-bit Block Size Cipher Suites Supported (SWEET32)
nano /etc/gitlab/gitlab.rb
Edit the file to show the below
nginx['ssl_ciphers']="HIGH:!aNULL:!MD5:!3DES"
nginx['ssl_prefer_server_ciphers'] = "on"
Then run reconfig
sudo gitlab-ctl reconfigure