Can't deploy artifacts due to "reject HostKey" error

This is the high-level error info:

plugin:repository-deploy:
[echo] Deploying...
Will deploy to 1 repository(ies): maven.plugins.sf.snapshots
Deploying to repository: maven.plugins.sf.snapshots
Failed to deploy to: maven.plugins.sf.snapshots Reason: org.apache.maven.wagon.authentication.AuthenticationException: Cannot connect. Reason: reject HostKey: shell.sourceforge.net
org.apache.maven.wagon.authentication.AuthenticationException: Cannot connect. Reason: reject HostKey: shell.sourceforge.net
at org.apache.maven.wagon.providers.ssh.AbstractSshWagon.openConnection(AbstractSshWagon.java:232)

If I use m1.1b3-snapshot of 6/30 from Arnaud's website, it works. Any snapshot after that and the b3 release do not work - they have this problem.

I think (but not sure) one key procedure to reproducing this is to start with clean repo and plugins install area: delete the .maven dir and any existing Maven program dir (the plugins must start with only the bundled ones).