Problem with Jenkins accessing Mercurial repository on bitbucket.org

My Jenkins server has stopped being able to build a maven project hosted at bitbucket.org. The build works locally but Jenkins reports this error:

[workspace] $ hg incoming --quiet --bundle hg.bundle --template "<changeset node='{node}' author='{author|xmlescape}' rev='{rev}' date='{date}'><msg>{desc|xmlescape}</msg><added>{file_adds|stringify|xmlescape}</added><deleted>{file_dels|stringify|xmlescape}</deleted><files>{files|stringify|xmlescape}</files><parents>{parents}</parents></changeset>\n" --rev default
abort: no suitable response from remote hg!
ERROR: Failed to determine incoming changes
[workspace] $ hg log --rev . --template {node}

Any ideas what's going on?

[edit]

So, I ran hg paths and got a response that the tomcat user was untrusted:

Not trusting file /usr/local/tomcat/.jenkins/jobs/Test/workspace/.hg/hgrc from untrusted user tomcat, group tomcat

After running hg incoming as the tomcat user

cd /usr/local/tomcat/.jenkins/jobs/Test/workspace
sudo -u tomcat hg incoming 

I got an error saying the permissions on my ssh key were too open:

remote: @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
remote: @         WARNING: UNPROTECTED PRIVATE KEY FILE!          @
remote: @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
remote: Permissions 0620 for '/usr/local/tomcat/.ssh/id_rsa' are too open.
remote: It is recommended that your private key files are NOT accessible by others.
re开发者_如何转开发mote: This private key will be ignored.
remote: bad permissions: ignore key: /usr/local/tomcat/.ssh/id_rsa
remote: Permission denied (publickey).
abort: no suitable response from remote hg!

and thanks to this SO question

I set the permissions and now Jenkins can successfully build.

Since your hg incoming is based on whatever your 'default' path is in the repository's hgrc (use hg paths to see them, or open the file), maybe you should make sure the address of the remote repository is still correct and that the project is still accessible.