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According to http://sublimation.org/scponly/wiki/index.php/FAQ

I can't connect to scponly using scp, what do I do?

scponly was recently changed (in version 4.2) to not allow scp by default. To enable scponly run configure with the --enable-scp-compat flag, and then reinstall scponly using the "make; make install" process.