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Mat
Asked: 2017-01-23 14:11:03 +0800 CST

Squid 502 errors

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I am using Squid 3.3.13 with no cache enabled and all my clients in LAN are using it to access to HTTP and HTTPS websites. I am not using it as transparent proxy but clients have it configured in OS preferences.

It works, but I'm getting some random (104) Connection rest by peer errors on some websites, for example www.tim.it and www.impresasemplice.it, like what you see on this screenshot:

Screenshot of the error I'm getting from clients when access one of problematic websites

The strane things are:

  • I am not getting this error from every clients but I have it randomly only on some of them
  • I am not getting this error for every websites but only on a list of them
  • When I get this error it goes away if I retry to reload the page on the same website 3/4 times
  • In the same time I am getting the error on the client I can access the same website from the proxy itself with no problems (using a browser like elinks from the command line of the proxy server (CentOS centos-release-6-8.el6.centos.12.3.x86_64)

Looking in the Squid's access.log file I see a 502 error when I get the error from the client. 502 error is "bad gateway", but if I have bad gateway why I can access the same website from elinks on the same time?

[Thu Jan 19 18:05:26 2017].837     56 10.1.3.223 TCP_MISS/502 4489 GET http://www.tim.it/ - HIER_DIRECT/156.54.69.9 text/html
[Thu Jan 19 18:06:47 2017].655     54 10.1.3.223 TCP_MISS/502 4525 GET http://www.tim.it/ - HIER_DIRECT/156.54.69.9 text/html
[Thu Jan 19 18:06:48 2017].099     60 10.1.3.223 TCP_MISS/301 591 GET http://www.tim.it/favicon.ico - HIER_DIRECT/156.54.69.9 text/html
[Thu Jan 19 18:06:48 2017].136     29 10.1.3.223 TCP_MISS/200 0 CONNECT www.tim.it:443 - HIER_DIRECT/156.54.69.9 -
[Thu Jan 19 18:07:04 2017].305  16165 10.1.3.223 TCP_MISS/200 19410 CONNECT www.tim.it:443 - HIER_DIRECT/156.54.69.9 -
[Thu Jan 19 18:07:13 2017].540     90 10.1.3.223 TCP_MISS/301 569 GET http://www.tim.it/ - HIER_DIRECT/156.54.69.9 text/html
[Thu Jan 19 18:07:27 2017].532  13988 10.1.3.223 TCP_MISS/200 3396 CONNECT www.tim.it:443 - HIER_DIRECT/156.54.69.9 -
[Thu Jan 19 18:07:27 2017].540  13996 10.1.3.223 TCP_MISS/200 131005 CONNECT www.tim.it:443 - HIER_DIRECT/156.54.69.9 -
[Thu Jan 19 18:07:44 2017].743  17196 10.1.3.223 TCP_MISS/200 143879 CONNECT www.tim.it:443 - HIER_DIRECT/156.54.69.9 -

Could you help me to find out where I am wrong, please?

squid 502-error

0 Answers