Slow SSH response time

[XSLTel]

Hello,

I have this problem on my Test box

Information & Problem

***Problem***
ssh -v user@host
OpenSSH_5.5p1 Debian-4ubuntu5, OpenSSL 0.9.8o 01 Jun 2010
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Applying options for *
debug1: Connecting to host [XX.XXX.XX.XXX] port 22.
debug1: Connection established.
debug1: identity file /home/user/.ssh/id_rsa type 1
debug1: Checking blacklist file /usr/share/ssh/blacklist.RSA-2048
debug1: Checking blacklist file /etc/ssh/blacklist.RSA-2048
debug1: identity file /home/user/.ssh/id_rsa-cert type -1
debug1: identity file /home/user/.ssh/id_dsa type -1
debug1: identity file /home/user/.ssh/id_dsa-cert type -1

--------------->Delay (4-5 secs)<---------------

debug1: Remote protocol version 2.0, remote software version
OpenSSH_5.3p1 Debian-3ubuntu6
debug1: match: OpenSSH_5.3p1 Debian-3ubuntu6 pat OpenSSH*
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_5.5p1 Debian-4ubuntu5
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: server->client aes128-ctr hmac-md5 none
debug1: kex: client->server aes128-ctr hmac-md5 none
debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<1024<8192) sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP
debug1: SSH2_MSG_KEX_DH_GEX_INIT sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY
debug1: Host 'host' is known and matches the RSA host key.
debug1: Found key in /home/user/.ssh/known_hosts:9
debug1: ssh_rsa_verify: signature correct
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug1: SSH2_MSG_NEWKEYS received
debug1: Roaming not allowed by server
debug1: SSH2_MSG_SERVICE_REQUEST sent
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug1: Authentications that can continue: publickey,password
debug1: Next authentication method: publickey
debug1: Offering public key: /home/user/.ssh/id_rsa
debug1: Authentications that can continue: publickey,password
debug1: Trying private key: /home/user/.ssh/id_dsa
debug1: Next authentication method: password
user@host's password:

Solution

placing in the sshd_config file "UseDNS no" and reloading/restarting the OpenSSH server

vi /etc/ssh/sshd_config
##PRESS i TO SWITCH TO INSERT MODE
##SCROLL DOWN UNTIL YOU FIND (UseDNS yes)
##REMOVE yes AND REPLACE IT WITH no

XSLTel Reviewed by XSLTel on 13th Apr 2011. Slow SSH response time Hello, I have this problem on my Test box Information & Problem ***Problem*** ssh -v user@host OpenSSH_5.5p1 Debian-4ubuntu5, OpenSSL 0.9.8o 01 Jun 2010 debug1: Reading configuration data /etc/ssh/ssh_config debug1: Applying options for * Rating: 5

[DoctorX]

Nice tutorial.
Thank you XSLTel