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I am trying to debug an issue with Apache 2.4 on Debian 8 (jessie). I notice lines like the following in my /var/log/apache2/error.log:

[Sun May 15 11:53:10.526964 2016] [authz_core:error] [pid 14805] [client 32.135.203.150:43595] AH01630: client denied by server configuration: /var/www/html/admin/

Question: in [client] block, what does the part :43595 means? I would guess it's a port number, but I am not sure since it doesn't appear in Apache documentation and it's not described in /usr/share/doc/apache2/README.Debian.gz either. I also tried to find if the log format isn't customized somewhere, but grep -rnw '/etc/apache2/' -e 'ErrorLogFormat' returns nothing.

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    That's standard notation for IPv4:Port it is not limited to Apache httpd. Also it's a colon not a semi-colon.
    – user9517
    May 15, 2016 at 12:17
  • Sorry about mixing the two! I know it's standard, but it doesnt appear in documentation for some reason and isn't described in file that tells differences between vanilla and Debian versions of Apache. I thought it may have other meaning.
    – Red
    May 15, 2016 at 12:23

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Yes, that is the standard notation for port numbers when describing TCP / UDP connection endpoints.

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  • Then why it doesn't appear in documentation example? Do you know if it's configured separately?
    – Red
    May 15, 2016 at 11:40
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    The Apache in Debian could be a customized version that includes the port number by default in the logs. This is just an educated guess though.
    – Tero Kilkanen
    May 15, 2016 at 11:43

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