When using the latest snapshot, some ssh clients are unable to connect.
I don't know whether this is due to a problem with the client or the
server, but hope someone can point me in the right direction. If it is a
server problem, I will of course send a proper bug report.

I first noticed the problem when using an older version of putty on a
Windows terminal server. After updating it to the latest version it
worked fine, so I'm thinking it's a client problem. However, later I see
that both Xming and X-win32 get the same error, though both are using
the latest version of putty.

This is the snapshot:

OpenBSD 5.5-current (GENERIC.MP) #44: Mon Mar 31 11:14:26 MDT 2014
    [email protected]:/usr/src/sys/arch/amd64/compile/GENERIC.MP

This is the error on X-Win32:

Looking up host "herakles.walkertx.com"
Connecting to 192.168.60.74 port 22
Using SSPI from SECUR32.DLL
Server version: SSH-2.0-OpenSSH_6.6
Using SSH protocol version 2
We claim version: SSH-2.0-PuTTY_Local:_Aug_17_2012_15:07:42
GSSAPI key-exchange initialisation failed
No credentials are available in the security package.
Doing Diffie-Hellman group exchange
Server unexpectedly closed network connection
FATAL ERROR: Server unexpectedly closed network connection

This is from /var/log/authlog:

Apr  1 11:20:03 herakles sshd[9594]: Server listening on 0.0.0.0 port 22.
Apr  1 11:20:03 herakles sshd[9594]: Server listening on :: port 22.
Apr  1 11:35:53 herakles sshd[27087]: fatal: no matching mac found: client 
hmac-sha1,hmac-sha1-96,hmac-md5 server 
[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512
 [preauth]
Apr  1 11:40:47 herakles sshd[28093]: Accepted publickey for eperea from 
192.168.61.11 port 57192 ssh2: ECDSA 
81:3b:89:f2:25:23:09:a1:16:8b:de:08:57:83:b4:20
Apr  1 11:45:22 herakles sshd[20497]: Accepted publickey for eperea from 
192.168.61.11 port 57151 ssh2: RSA 
ea:de:cc:6a:87:83:d1:39:fd:44:8b:28:a5:46:1e:87

The failure was from X-Win32, the following three two were from an
OpenBSD 5.5 VM and the latest putty.

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