"UseDNS no" is conflict with "Match User xxx"?

Question

Last night I added UseDNS no to my sshd_config, after I restarted ssh via sudo service ssh restart, I found sshd not started and there is no process listened on port 22, but after I deleted UseDNS no, it will work as before.

I have compared with another server's sshd_config, only three lines are different (this server used sftp, so these lines are added):

Match User editor
ChrootDirectory /opt/ljmall-staging/var/editor-rootfs
ForceCommand internal-sftp

I have tried commet ChrootDirectory and ForceCommand, it doesn't work, it means Match User and UseDNS no is conflicted?

Server OS: Ubuntu 14.04.3 LTS
Openssh-server: 1:6.6p1-2ubuntu2.7

Configuring an SSH server is not programming. This question is off topic for this site. — nobody, Jun 01 '16 at 01:33
oh, which site should I go? serverfault is right? @AndrewMedico — dawncold, Jun 01 '16 at 01:36
I have figured it out, my `UseDNS no` added after `Match User` line !!!! — dawncold, Jun 01 '16 at 01:41

score 0 · Accepted Answer · answered Jun 01 '16 at 06:37

0

They are not in conflict, but Match creates a new conditional block and UseDNS is not allowed in the conditional blocks.

Moving UseDNS above the Match block will solve your issue.

answered Jun 01 '16 at 06:37

Jakuje

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"UseDNS no" is conflict with "Match User xxx"?

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