diff -r 464bedc0fdb4 -r 7218e93ade47 mercurial/sshpeer.py
--- a/mercurial/sshpeer.py	Mon Feb 12 16:33:54 2018 -0800
+++ b/mercurial/sshpeer.py	Thu Feb 08 11:39:23 2018 -0800
@@ -313,6 +313,8 @@
         if not capsline.startswith('capabilities: '):
             badresponse()
 
+        ui.debug('remote: %s\n' % capsline)
+
         caps.update(capsline.split(':')[1].split())
         # Trailing newline.
         stdout.read(1)