This option was disabled to simplify use of port forwarding.
You can enable it and pass "-s none" to ssh.
--- a/.ssh/config Tue Feb 07 01:33:56 2012 +0200
+++ b/.ssh/config Mon Feb 13 17:06:41 2012 +0200
@@ -1,9 +1,12 @@
+
+Host *
# Allow sharing of multiple sessions over a single network connection for all
# host. Also don't prompt for password when connection live.
-Host *
-ControlPath ~/.ssh/sock_%r@%h_%p
-ControlMaster auto
+# This option was disabled to simplify use of port forwarding.
+# You can enable it and pass "-s none" to ssh.
+# ControlPath ~/.ssh/sock_%r@%h_%p
+# ControlMaster auto
# This by default.
# UserKnownHostsFile ~/.ssh/known_hosts