That distinction will still most likely be shown to be a configuration issue rather than a bug in the software.
If you wish to continue with the bug report, please provide sufficient information so that someone else can duplicate the problem in their environment. The report you've submitted is missing many, many critical details. The community will tend to help you identify those critical details without consuming the time of the one person that does most of the testing and maintenance work on the git plugin.
Many of the general items you'll need to provide in the bug report are described in "How to report an issue". Once those general items have been gathered and investigated, then you'll need to provide the details of the specific problem you've reported. If you use the mailing list or chat, you have a much larger pool of people that may be able to spend their time assisting you with the issue.
Specific details that will be needed for this use case:
Numbered series of steps which lead from freshly installed system to duplicate the problem
Jenkins master platform (Windows, Linux, etc.)
Jenkins agent platform where it is succeeding
Authentication technique used (assumed https and username / password, but could be http and username / password)
Network configuration surprises (is there a proxy between the agent and the git server, is there a proxy between the master and the git server, etc.)
Special cases in directory, username or password (does the workspace directory path contain a space, does the password contain characters which are special to the shell, does the username include any surprising characters)
Git plugin version
Git client plugin version
Job definition which shows the problem
Is the failure specific to this job or do all jobs which use this git server have the same problem?
Is the failure specific to this git server or does the same thing happen with publicly accessible git servers (like github.com or bitbucket.org)?
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