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We have a server that has recently gotten into an issue where the TTFB (Time To First Byte) takes 2.0 minutes to pass on some subpages of a website. Some other websites, hosted on the same server, does not experience. The wierd part is that when this is happening it seems to be always 2 minutes, hinting something is timing out, but the response is 200.

TTFB on affected site

What could be causing this extremely long TTFB ?

The webserver is a Ubuntu version 10.04 running Apache 2 with PHP 5.3.2

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  • Anything in PHP / Apache log files? You should also upgrade your PHP, that version is ancient snd prone to security issues.
    – Tero Kilkanen
    Nov 2, 2016 at 20:13
  • Logs didn't show anything it seemed and yes this is indeed a very old server, but there is currently no intention of getting it updated I'm afraid (boss decision).
    – Daniel Jørgensen
    Nov 3, 2016 at 6:52

1 Answer 1

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The answer to this problem was a wrong DNS setting in the network interfaces configuration file in linux.

The first DNS entry was to a server which was offline. Removing this and relying on googles DNS solved the problem completely. However im still not sure why it would only affect certain subpages on some sites.

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  • hi @daniel can you explain a bit further, i seem to have a similar issue, but am new to linux
    – Naval
    May 22, 2020 at 19:03
  • @Naval - You need to figure out how to update your servers DNS settings. What was causing this for us, was that the server the site was hosted on, had set a DNS server that did not exist. If you change your servers DNS settings to, say googles (8.8.8.8) it might fix it for you
    – Daniel Jørgensen
    May 22, 2020 at 22:44
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    Thanks @daniel it helped
    – Naval
    Jun 3, 2020 at 10:35

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