Gitlab - Too many authentication failures for git

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In SourceTree, try changing SSH Client from PuTTY/Plink to Open SSH.

You can use a different ssh url in order to reference the right public/private key you want.
Add in your HOME/.ssh a file named config:

Host            mygitlab
Hostname        gitlab.xxx.com
User            git
IdentityFile    ~/.ssh/id_rsa.gitlab
IdentitiesOnly yes

And change your url:

git clone mygitlab:xxx/myproj.git myproj

That way, you avoid the default ssh behavior which presents every keys for ssh to try.

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