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I have a server with OS RHEL 6 and Apache/2.2.22, sometime I found this error in Apache error log:

[error] [client XXXXX] Timeout: nslookup("type" => "MX", "host" => "") at /usr/local/share/perl5/Net/ line 114.

[error] [client XXXXX] Timeout: nslookup("type" => "MX", "host" => "") at /usr/local/share/perl5/Net/ line 114.

[error] [client XXXXX] Timeout: nslookup("type" => "MX", "host" => "") at /usr/local/share/perl5/Net/ line 114.

Is this a DNS problem?

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migrated from Mar 26 '13 at 9:40

This question came from our site for professional and enthusiast programmers.

This question should more properly be on Serverfault, which is the sister site of this one but for server admins rather than programmers. I've flagged it for a moderator to move it there. – Jenny D Mar 26 '13 at 7:57

It means that something running, probably some kind of mail form running as a cgi, from a web page at your site is getting a timeout when trying to lookup hostnames and is getting a timeout. So yes, that's a DNS problem, probably with the resolv.conf setting for your server.

If you are not aware of any mail form script running on your server, you have a bigger problem on your hands - in that case, you're likely being abused by spammers.

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