Too many authentication failures

[Vladimir Kuzmin]

Hello. I have Sourcetree V3.0.15 installed. When I try to pull (for example) from our private Git repo (connecting via SSH), I receive following error

Access denied
Access denied
Access denied
Access denied
Access denied
FATAL ERROR: Server sent disconnect message
type 2 (protocol error):
"Too many authentication failures for user_name"

For auth, we use login/password scheme, so switching to OpenSSH is not an option. 
Is there any solution for this problem? I remember that prior to Sourcetree V2 there was no such problem.

[Vladimir Kuzmin]

Looks like there were some problems with credentials stored, because removal of SourceTree passwd file (as mentioned here) solved the problem.

Anyway, I still don't know why it happened. Credentials were exactly the same

[Chris Middleton]

Thank you. This helped!