We don't modify this in Debian/Ubuntu. The default was changed to
"UseDNS no" in OpenSSH 6.8p1, which is in Ubuntu 15.10 and later.
** Changed in: openssh (Ubuntu)
Status: Confirmed => Fix Released
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the bug i filed with openssh was marked WONTFIX. the developer who did
so claims that the openssh default is UseDNS=no.
can somebody check if the latest ubuntu default is still UseDNS=yes?
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instead of asking the OpenSSH project to change their default
configuration, i filed a bug to have the lookup not be blocking.
Bug 2545 - reverse DNS lookups shouldn't block login
https://bugzilla.mindrot.org/show_bug.cgi?id=2545
** Bug watch added: OpenSSH Portable Bugzilla #2545
Does someone sent this upstream?
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https://bugs.launchpad.net/bugs/424371
Title:
Logins to OpenSSH server slow due to "UseDNS yes" config
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Just to note: This problem still exists in Ubuntu 14.04LTS and 14.10.
It's annoying because I have to make changes to every new installation.
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I'd propose submitting a request upstream to make the default setting
for UseDNS be No.
Additionally add comments in the sshd_config and man page:
# UseDNS - Determines whether IP Address to Hostname lookup and comparison is
performed
# Default value is No which avoids login delays when the
I have this same issue, but on Fedora (yes, I realize this is an ubuntu
forum)
On Fedora, I have the issue on 5.2 openssh (FC10+) but not on 5.1 (FC9)
If a host is in the hosts file, it connects instantly. If it needs to
check DNS, it takes 15 seconds or more to connect. There's no slowness
to
Lunch, I did not have that line in the nsswitch.conf file, I had already
checked.
And yes Chuck, I am still experiencing it (and I found another computer
that is also doing it, Cent OS 4.5, same version of OpenSSH)
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Logins to OpenSSH server slow due to UseDNS yes config
Hi,
I was wondering if you were still having this problem?
Regards
chuck
** Changed in: openssh (Ubuntu)
Importance: Undecided = Low
** Changed in: openssh (Ubuntu)
Status: New = Incomplete
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Logins to OpenSSH server slow due to UseDNS yes config
I found this and it worked...
go into your /etc/nsswitch.conf file and comment out the hosts line -
apparently the delay is caused by mdns time outs...
Restart your ssh server and you should be good to go.
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Logins to OpenSSH server slow due to UseDNS yes config
After reading more about UseDNS, the more pertinent issue is what is the
point of it at all if a false IP for the hostname is still accepted as a
valid connection.
Also, why is there no setting to make it timeout after a certain number
of seconds (aka, what if the DNS request didn't time out for
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