http remote with authentication

When I use ungit on my local workstation, trying to have a look at a local git repo, I can sometime have some errors trying to look at the content of a commit.

My git repository has an http remote repository, this remote repository requires some credentials as the remote repository is private.

When I open ungit, I have to enter my login and my password in order to see commits and their content.

After a while, I can still see the commit tree, but I can't see the commit content of each commit.

It looks like the connection to the remote has expired, or the auth has expired, and there is no more connection to the remote, it becomes hence impossible to retrieve the content of all commits that are not already cached.