http://marc.theaimsgroup.com/?l=openbsd-misc&w=2&r=1&s=corrupted+mac+input&q=b

  happening for anyone else with:

OpenBSD 4.1 (GENERIC) #1430: Wed Mar  7 01:04:27 MST 2007
    [EMAIL PROTECTED]:/usr/src/sys/arch/i386/compile/GENERIC

  have been running a 3.9-current on there up till last week with
  no corrupted MAC on input, did a snapshot, now it's back
  all over the place.

  ssh to the machine and just hit enter a lot, it dies
  anywhere between 16s and 2m with:

---
Received disconnect from 192.168.7.27: 2: Corrupted MAC on input.
---

  ssh -vvvvvvvvvvvvvvvvv has no more info from the client side; 
  from the server side, -Dddddddddddddddddddddd doesn't
  seem to say anything interesting when it dies:

----
debug3: tty_parse_modes: 93 0
debug1: server_input_channel_req: channel 0 request shell reply 0
debug1: session_by_channel: session 0 channel 0
debug1: session_input_channel_req: session 0 req shell
debug2: fd 4 setting TCP_NODELAY
debug2: channel 0: rfd 11 isatty
debug2: fd 11 setting O_NONBLOCK
debug3: fd 10 is O_NONBLOCK
debug1: Setting controlling tty using TIOCSCTTY.
Disconnecting: Corrupted MAC on input.
debug3: channel 0: close_fds r 11 w 10 e -1 c -1
debug1: do_cleanup
debug1: do_cleanup
debug1: session_pty_cleanup: session 0 release /dev/ttyp0
----

  when i did the snapshot, the ssh configs changed a bit:

$ sudo diff -U0 /var/backups/etc_ssh_ssh_config.backup 
/var/backups/etc_ssh_ssh_config.current
--- /var/backups/etc_ssh_ssh_config.backup      Mon Apr  3 17:50:50 2006
+++ /var/backups/etc_ssh_ssh_config.current     Sun Jun 25 18:26:43 2006
@@ -1 +1 @@
-#      $OpenBSD: ssh_config,v 1.21 2005/12/06 22:38:27 reyk Exp $
+#      $OpenBSD: ssh_config,v 1.22 2006/05/29 12:56:33 dtucker Exp $
@@ -26,0 +27,2 @@
+#   GSSAPIAuthentication no
+#   GSSAPIDelegateCredentials no


$ sudo diff -U0 /var/backups/etc_ssh_sshd_config.backup 
/var/backups/etc_ssh_sshd_config.current
--- /var/backups/etc_ssh_sshd_config.backup     Thu Oct 12 10:56:18 2006
+++ /var/backups/etc_ssh_sshd_config.current    Wed Mar  7 17:01:53 2007
@@ -1 +1 @@
-#      $OpenBSD: sshd_config,v 1.73 2005/12/06 22:38:28 reyk Exp $
+#      $OpenBSD: sshd_config,v 1.74 2006/07/19 13:07:10 dtucker Exp $
@@ -13 +12,0 @@
-#Protocol 2
@@ -37 +35,0 @@
-PermitRootLogin forced-commands-only
@@ -90 +87,0 @@
-PermitTunnel ethernet
@@ -96,0 +94,6 @@
+
+# Example of overriding settings on a per-user basis
+#Match User anoncvs
+#      X11Forwarding no
+#      AllowTcpForwarding no
+#      ForceCommand cvs server

  reverting the PermitTunnel doesn't do anything to make it stop

-- 

  jared

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