We are getting this error with one particular git repository although other are working fine.
When adding the repository, it clones, and then indexes fine but then we get the following error:
Unable to fetch from remote repository: ssh://user@server/path/to/git/directory - 
The failing command seems to be
git fetch ssh://user@server/path/to/git/directory +refs/*:refs/*
We don't quite know why this error is occurring only with this new git directory. Any assistance here would be greatly appreciated.