Re: [CentOS] long delay when logging in
On 16/11/16 11:06 PM, Peter wrote: > On 17/11/16 16:34, Digimer wrote: >> Edit /etc/ssh/sshd_config >> >> Set: >> >> UseDNS no >> GSSAPIAuthentication no >> >> Save, restart sshd, try again. > > This will certainly stop the long timeout, but I prefer telling people > to fix their DNS. The long timeout is indicative of a DNS issue and > turning off DNS for ssh is just masking the real problem. I prefer to > leave DNS on for ssh as it's a good indicator for me of when I have to > fix something. > > > Peter It can also happen if the target has lost its internet connection, is air-gapped or otherwise legitimately offline. Your point is valid, though, if the Internet should be up. -- Digimer Papers and Projects: https://alteeve.ca/w/ What if the cure for cancer is trapped in the mind of a person without access to education? ___ CentOS mailing list CentOS@centos.org https://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] long delay when logging in
On 17/11/16 16:34, Digimer wrote: > Edit /etc/ssh/sshd_config > > Set: > > UseDNS no > GSSAPIAuthentication no > > Save, restart sshd, try again. This will certainly stop the long timeout, but I prefer telling people to fix their DNS. The long timeout is indicative of a DNS issue and turning off DNS for ssh is just masking the real problem. I prefer to leave DNS on for ssh as it's a good indicator for me of when I have to fix something. Peter ___ CentOS mailing list CentOS@centos.org https://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] long delay when logging in
Edit /etc/ssh/sshd_config Set: UseDNS no GSSAPIAuthentication no Save, restart sshd, try again. digimer On 16/11/16 06:07 PM, Larry Martell wrote: > I have a CentOS 7 system and when I login with putty or ssh there is a > long delay before I get the password prompt. I ran ssh -v and I found > that it gets up to this: > > debug1: ssh_ecdsa_verify: signature correct > debug1: SSH2_MSG_NEWKEYS sent > debug1: expecting SSH2_MSG_NEWKEYS > debug1: SSH2_MSG_NEWKEYS received > debug1: SSH2_MSG_SERVICE_REQUEST sent > debug1: SSH2_MSG_SERVICE_ACCEPT received > > and then it sits there for 1-2 minutes and then this output blasts out: > > debug1: Authentications that can continue: > publickey,gssapi-keyex,gssapi-with-mic,password > debug1: Next authentication method: gssapi-keyex > debug1: No valid Key exchange context > debug1: Next authentication method: gssapi-with-mic > debug1: Unspecified GSS failure. Minor code may provide more information > No Kerberos credentials available > debug1: Unspecified GSS failure. Minor code may provide more information > No Kerberos credentials available > debug1: Unspecified GSS failure. Minor code may provide more information > debug1: Unspecified GSS failure. Minor code may provide more information > No Kerberos credentials available > debug1: Next authentication method: publickey > debug1: Trying private key: /home/motor/.ssh/id_rsa > debug1: Trying private key: /home/motor/.ssh/id_dsa > debug1: Trying private key: /home/motor/.ssh/id_ecdsa > debug1: Trying private key: /home/motor/.ssh/id_ed25519 > debug1: Next authentication method: password > > And then the password prompt comes out. This happens no matter which > user is logging in. It only happens on the 1 system. I have 5 others > where the proceeds without the delay. > > There are no disk or memory or any other errors in the logs. > > > What could be causing it to delay like this? > ___ > CentOS mailing list > CentOS@centos.org > https://lists.centos.org/mailman/listinfo/centos > -- Digimer Papers and Projects: https://alteeve.ca/w/ What if the cure for cancer is trapped in the mind of a person without access to education? ___ CentOS mailing list CentOS@centos.org https://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] long delay when logging in
On 11/16/2016 3:07 PM, Larry Martell wrote: I have a CentOS 7 system and when I login with putty or ssh there is a long delay before I get the password prompt. I ran ssh -v and I found that it gets up to this: debug1: ssh_ecdsa_verify: signature correct debug1: SSH2_MSG_NEWKEYS sent debug1: expecting SSH2_MSG_NEWKEYS debug1: SSH2_MSG_NEWKEYS received debug1: SSH2_MSG_SERVICE_REQUEST sent debug1: SSH2_MSG_SERVICE_ACCEPT received and then it sits there for 1-2 minutes and then this output blasts out: wild guess says someone is doing a reverse DNS lookup thats timing out. -- john r pierce, recycling bits in santa cruz ___ CentOS mailing list CentOS@centos.org https://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] long delay when logging in
On Wed, November 16, 2016 5:07 pm, Larry Martell wrote: > I have a CentOS 7 system and when I login with putty or ssh there is a > long delay before I get the password prompt. First thing I would check is that that system doesn't have unaccessible DNS server listed in: /etc/resolv.conf (another thing, similarly DNS related: if you have caching name server on that box, check if that doesn't cause delay the you see). Valeri > I ran ssh -v and I found > that it gets up to this: > > debug1: ssh_ecdsa_verify: signature correct > debug1: SSH2_MSG_NEWKEYS sent > debug1: expecting SSH2_MSG_NEWKEYS > debug1: SSH2_MSG_NEWKEYS received > debug1: SSH2_MSG_SERVICE_REQUEST sent > debug1: SSH2_MSG_SERVICE_ACCEPT received > > and then it sits there for 1-2 minutes and then this output blasts out: > > debug1: Authentications that can continue: > publickey,gssapi-keyex,gssapi-with-mic,password > debug1: Next authentication method: gssapi-keyex > debug1: No valid Key exchange context > debug1: Next authentication method: gssapi-with-mic > debug1: Unspecified GSS failure. Minor code may provide more information > No Kerberos credentials available > debug1: Unspecified GSS failure. Minor code may provide more information > No Kerberos credentials available > debug1: Unspecified GSS failure. Minor code may provide more information > debug1: Unspecified GSS failure. Minor code may provide more information > No Kerberos credentials available > debug1: Next authentication method: publickey > debug1: Trying private key: /home/motor/.ssh/id_rsa > debug1: Trying private key: /home/motor/.ssh/id_dsa > debug1: Trying private key: /home/motor/.ssh/id_ecdsa > debug1: Trying private key: /home/motor/.ssh/id_ed25519 > debug1: Next authentication method: password > > And then the password prompt comes out. This happens no matter which > user is logging in. It only happens on the 1 system. I have 5 others > where the proceeds without the delay. > > There are no disk or memory or any other errors in the logs. > > > What could be causing it to delay like this? > ___ > CentOS mailing list > CentOS@centos.org > https://lists.centos.org/mailman/listinfo/centos > Valeri Galtsev Sr System Administrator Department of Astronomy and Astrophysics Kavli Institute for Cosmological Physics University of Chicago Phone: 773-702-4247 ___ CentOS mailing list CentOS@centos.org https://lists.centos.org/mailman/listinfo/centos
[CentOS] long delay when logging in
I have a CentOS 7 system and when I login with putty or ssh there is a long delay before I get the password prompt. I ran ssh -v and I found that it gets up to this: debug1: ssh_ecdsa_verify: signature correct debug1: SSH2_MSG_NEWKEYS sent debug1: expecting SSH2_MSG_NEWKEYS debug1: SSH2_MSG_NEWKEYS received debug1: SSH2_MSG_SERVICE_REQUEST sent debug1: SSH2_MSG_SERVICE_ACCEPT received and then it sits there for 1-2 minutes and then this output blasts out: debug1: Authentications that can continue: publickey,gssapi-keyex,gssapi-with-mic,password debug1: Next authentication method: gssapi-keyex debug1: No valid Key exchange context debug1: Next authentication method: gssapi-with-mic debug1: Unspecified GSS failure. Minor code may provide more information No Kerberos credentials available debug1: Unspecified GSS failure. Minor code may provide more information No Kerberos credentials available debug1: Unspecified GSS failure. Minor code may provide more information debug1: Unspecified GSS failure. Minor code may provide more information No Kerberos credentials available debug1: Next authentication method: publickey debug1: Trying private key: /home/motor/.ssh/id_rsa debug1: Trying private key: /home/motor/.ssh/id_dsa debug1: Trying private key: /home/motor/.ssh/id_ecdsa debug1: Trying private key: /home/motor/.ssh/id_ed25519 debug1: Next authentication method: password And then the password prompt comes out. This happens no matter which user is logging in. It only happens on the 1 system. I have 5 others where the proceeds without the delay. There are no disk or memory or any other errors in the logs. What could be causing it to delay like this? ___ CentOS mailing list CentOS@centos.org https://lists.centos.org/mailman/listinfo/centos
