diff -r 3b99eb028859 -r 6e6d68c2d39c mercurial/wireproto.py
--- a/mercurial/wireproto.py	Wed Mar 28 16:10:41 2018 -0700
+++ b/mercurial/wireproto.py	Wed Mar 28 16:14:42 2018 -0700
@@ -1010,7 +1010,7 @@
     h = repo.heads()
     return wireprototypes.bytesresponse(encodelist(h) + '\n')
 
-@wireprotocommand('hello', permission='pull')
+@wireprotocommand('hello', permission='pull', transportpolicy=POLICY_V1_ONLY)
 def hello(repo, proto):
     """Called as part of SSH handshake to obtain server info.