I've had Eclipse installed for quite a while. I upgraded to 2018-12 a few weeks ago. I've had ssh authentication set up for all my git repos (centrally stored in BitBucket Server) for a long time. It's been working perfectly fine.
Today I had to reboot my Windows7 laptop for some automated installations, which happens a few times a month.
I restarted Eclipse and suddenly I'm finding that all of my git repos are failing authentication. I'm seeing this in the log:
!MESSAGE ssh://git@.../....git: No more authentication methods available
!STACK 0
org.eclipse.jgit.api.errors.TransportException: ssh://git@.../.....git: No more authentication methods available
at org.eclipse.jgit.api.FetchCommand.call(FetchCommand.java:254)
at org.eclipse.jgit.api.PullCommand.call(PullCommand.java:290)
at org.eclipse.egit.core.op.PullOperation$PullJob.run(PullOperation.java:256)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63)
Caused by: org.eclipse.jgit.errors.TransportException: ssh://git@.../.....git: No more authentication methods available
at org.eclipse.jgit.transport.sshd.SshdSessionFactory.getSession(SshdSessionFactory.java:249)
I then went to one of my local repositories in my Cygwin shell and tried a "git pull". This worked perfectly fine.
The only recent change I made that might be related to this is that I installed the Windows version of git, in addition to the Cygwin git. I put it at the end of the PATH. I don't see how that could be affecting this, as Eclipse is using jgit.
Update:
I think I just solved the problem, but I'm not sure what the real problem was.
When I installed 2018-12 a few weeks ago, I thought I noticed a mention of upcoming changes to what the default ssh client would be. I noticed that I was currently set to use JSch, and I thought the release notes said that it would be moving to "Apache MINA", so I decided to change it now and see how it worked. This was working fine for a couple of weeks.
Just now I tried changing that field back to "JSch" and then doing a pull. It worked fine. Just to be sure, I changed it back to "Apache MINA" and tried it again. Still failed. Changed it back to "JSch" and it's working.
I don't know what's going on here.