I\'m using SourceTree and try to clone from a general github repository, but I got this error:
fatal: unable to access \'https://github.com/mfitzp/15-
I had the same problem and my fix was:
1.update git to the latest version
2.in command line check your tls version with command: git config http.sslVersion
3.if the version is tlsv1.0 than you have to update it to tlsv1.2 with command:
and than the error won't be present anymore