can't connect after update to openssh-portable 3.6.1p2-5

[Jon Noack]

On 4.8-RELEASE-p10 machines I can't connect after updating to 
openssh-portable 3.6.1p2-5.  Updating steps:

1) cvsup
2) portupgrade -ar
3) /usr/local/bin/rc.d/sshd.sh stop
4) /usr/local/bin/rc.d/sshd.sh start

This worked fine on 5.1-RELEASE-p8 machines and has worked for several 
years now (since 4.4 days, I think).  There was nothing in the CVS 
commit description that said I needed to recompile anything else.

I do not have access to the machines right now (I was updating all the 
machines at once over SSH (I tested on a 5.1-RELEASE-p8 machine so I 
thought I was OK -- I'll test on every version in the future) -- steps 3 
and 4 are done with a shell script that doesn't result in termination of 
the current connection), but the output when trying to connect (scrubbed 
of identifying info) is below and the current sshd_config is at the bottom:

********************** debug output ***********************
$ ssh -vvv my.server.example.com
debug1: Reading configuration data /usr/local/etc/ssh/ssh_config
debug1: Rhosts Authentication disabled, originating port will not be 
trusted.
debug2: ssh_connect: needpriv 0
debug1: Connecting to my.server.example.com [xxx.xxx.xxx.xxx] port 22.
debug1: Connection established.
debug1: identity file /home/username/.ssh/identity type -1
debug1: identity file /home/username/.ssh/id_rsa type -1
debug1: identity file /home/username/.ssh/id_dsa type -1
debug1: Remote protocol version 2.0, remote software version OpenSSH_3.6.1p2
debug1: match: OpenSSH_3.6.1p2 pat OpenSSH*
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_3.6.1p2
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug2: kex_parse_kexinit: 
diffie-hellman-group-exchange-sha1,diffie-hellman-group1-sha1
debug2: kex_parse_kexinit: ssh-rsa,ssh-dss
debug2: kex_parse_kexinit: 
aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour,aes192-cbc,aes256-cbc,rijndael-cbc at lysator.liu.se
debug2: kex_parse_kexinit: 
aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour,aes192-cbc,aes256-cbc,rijndael-cbc at lysator.liu.se
debug2: kex_parse_kexinit: 
hmac-md5,hmac-sha1,hmac-ripemd160,hmac-ripemd160 at openssh.com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: 
hmac-md5,hmac-sha1,hmac-ripemd160,hmac-ripemd160 at openssh.com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: none,zlib
debug2: kex_parse_kexinit: none,zlib
debug2: kex_parse_kexinit:
debug2: kex_parse_kexinit:
debug2: kex_parse_kexinit: first_kex_follows 0
debug2: kex_parse_kexinit: reserved 0
debug2: kex_parse_kexinit: 
diffie-hellman-group-exchange-sha1,diffie-hellman-group1-sha1
debug2: kex_parse_kexinit: ssh-rsa
debug2: kex_parse_kexinit: 
aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour,aes192-cbc,aes256-cbc,rijndael-cbc at lysator.liu.se
debug2: kex_parse_kexinit: 
aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour,aes192-cbc,aes256-cbc,rijndael-cbc at lysator.liu.se
debug2: kex_parse_kexinit: 
hmac-md5,hmac-sha1,hmac-ripemd160,hmac-ripemd160 at openssh.com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: 
hmac-md5,hmac-sha1,hmac-ripemd160,hmac-ripemd160 at openssh.com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: none,zlib
debug2: kex_parse_kexinit: none,zlib
debug2: kex_parse_kexinit:
debug2: kex_parse_kexinit:
debug2: kex_parse_kexinit: first_kex_follows 0
debug2: kex_parse_kexinit: reserved 0
debug2: mac_init: found hmac-md5
debug1: kex: server->client aes128-cbc hmac-md5 none
debug2: mac_init: found hmac-md5
debug1: kex: client->server aes128-cbc hmac-md5 none
debug1: SSH2_MSG_KEX_DH_GEX_REQUEST sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP
debug2: dh_gen_key: priv key bits set: 131/256
debug2: bits set: 1577/3191
debug1: SSH2_MSG_KEX_DH_GEX_INIT sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY
debug3: check_host_in_hostfile: filename /home/username/.ssh/known_hosts2
debug3: check_host_in_hostfile: filename /usr/local/etc/ssh/ssh_known_hosts2
debug3: check_host_in_hostfile: filename /home/username/.ssh/known_hosts2
debug3: check_host_in_hostfile: filename /usr/local/etc/ssh/ssh_known_hosts2
debug3: check_host_in_hostfile: filename /home/username/.ssh/known_hosts
debug3: check_host_in_hostfile: match line 9
debug3: check_host_in_hostfile: filename /home/username/.ssh/known_hosts
debug3: check_host_in_hostfile: match line 9
debug1: Host 'my.server.example.com' is known and matches the RSA host key.
debug1: Found key in /home/username/.ssh/known_hosts:9
debug2: bits set: 1590/3191
debug1: ssh_rsa_verify: signature correct
debug2: kex_derive_keys
debug2: set_newkeys: mode 1
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug2: set_newkeys: mode 0
debug1: SSH2_MSG_NEWKEYS received
debug1: SSH2_MSG_SERVICE_REQUEST sent
debug2: service_accept: ssh-userauth
debug1: SSH2_MSG_SERVICE_ACCEPT received
Connection closed by xxx.xxx.xxx.xxx
debug1: Calling cleanup 0x8061dc0(0x0)
******************** end debug output *********************

*********************** sshd_config ***********************
Port 22
Protocol 2

HostKey /usr/local/etc/ssh/ssh_host_rsa_key

#PasswordAuthentication no
PermitRootLogin no
ChallengeResponseAuthentication no
PAMAuthenticationViaKbdInt no
UsePrivilegeSeparation yes

Subsystem       sftp    /usr/local/libexec/sftp-server
******************** end sshd_config **********************

Thanks for any help and/or suggestions,
Jon Noack