Thank you all for your answers! You probably didn't receive an earlier response of mine: ========================================================== Actually the problem seems to have been sorted out. Right after placing in the sshd_config file "UseDNS no" and reloading/restarting the OpenSSH server, no effect took place, but a few hours later my ssh response became instant (<1 sec) :) Strange.. Mike ========================================================== Actually the above is not entirely true. When I try to ssh into my desktop at home from a pc I use at work, the response is still slow, BUT I have tried to ssh into my desktop at home from multiple other pcs and the password prompt is instant. If it makes any difference, the pc at work runs on UBuntu 10.10, whereas all other pcs I've tried run on 8.04. Mike On Wed, Apr 13, 2011 at 11:20 AM, Saif El Sherei <SSherei@xxxxxxxxxxxx> wrote: > hello mike, > > Well normally DNS resolution slows any network activity down. Even in port scanning for example using nmap its prefered to use the -n switch to disable DNS resolution because it slows the scan down. > > Hope this helped to clarify things a bit. > > Regards, > > Saif > OSCP > > Sent from my iPhone. > > On Apr 13, 2011, at 5:14 AM, "Michael Sioutis" <papito.dit@xxxxxxxxx> wrote: > >> Actually the problem seems to have been sorted out. Right after >> placing in the sshd_config file "UseDNS no" and reloading/restarting >> the OpenSSH server, no effect took place, but a few hours later my ssh >> response became instant (<1 sec) :) >> Strange.. >> >> Mike >> >> On Tue, Apr 12, 2011 at 7:15 PM, Michael Sioutis <papito.dit@xxxxxxxxx> wrote: >>> Hello!! >>> >>> I have a slow ssh response time and I don't know what is causing it. >>> I'm providing you with some information and kindly requesting >>> your help. >>> >>> ***System*** >>> Linux Ubuntu 10.04.2 LTS 2.6.32-30-generic #59-Ubuntu SMP Tue Mar 1 >>> 21:30:46 UTC 2011 x86_64 GNU/Linux >>> >>> ***OpenSSH version*** >>> OpenSSH_5.3p1 Debian-3ubuntu6, OpenSSL 0.9.8k 25 Mar 2009 >>> >>> ***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: >>> >>> ***sshd_config file*** >>> Port 22 >>> Protocol 2 >>> HostKey /etc/ssh/ssh_host_rsa_key >>> HostKey /etc/ssh/ssh_host_dsa_key >>> UsePrivilegeSeparation yes >>> >>> KeyRegenerationInterval 3600 >>> ServerKeyBits 768 >>> >>> SyslogFacility AUTH >>> LogLevel INFO >>> >>> LoginGraceTime 120 >>> PermitRootLogin no >>> StrictModes yes >>> >>> RSAAuthentication yes >>> PubkeyAuthentication yes >>> >>> IgnoreRhosts yes >>> RhostsRSAAuthentication no >>> HostbasedAuthentication no >>> >>> PermitEmptyPasswords no >>> >>> ChallengeResponseAuthentication no >>> >>> X11Forwarding yes >>> X11DisplayOffset 10 >>> PrintMotd no >>> PrintLastLog yes >>> TCPKeepAlive yes >>> >>> AcceptEnv LANG LC_* >>> >>> Subsystem sftp /usr/lib/openssh/sftp-server >>> >>> UsePAM yes >>> UseDNS no >>> AllowUsers user >>> >>> Thank you for any information about this! >>> Mike >>> >> >
