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I'm running a Wordpress site with NGINX and php5-cgi. My setup works, in principle.

However, when there are requests in close succession, I sometimes see this strange error:

[error] 5057#0: *706 upstream sent unsupported FastCGI protocol version: 72 while reading response header from upstream, client: 123.45.67.89, server: www.some.domain, request: "GET /some-subpage/ HTTP/1.0", upstream: "fastcgi://127.0.0.1:12345", host: "www.some.domain", referrer: "http://www.some.domain/some-subpage/"

This will happen even if I have only two subsequent requests, if both involve PHP sources.

My upstream does fastcgi_pass the request to a socket which should be capable of dealing with several requests. I create the socket like this:

/usr/bin/spawn-fcgi -s /path-to/some.sock -P /path-to/some.pid -C 8 -f /usr/bin/php5-cgi

What did I configure wrong?

** i didnt use php'fpm because it is version 5.3.3 and for some reason i cant manage to update it to 7.x+ and when i serve my site with php-fpm my theme and plugins are all messed up dur to the old php version :(

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  • Is there any reason you do not use php-fpm? It is certainly a popular approach, which means well tested. Commented Dec 2, 2016 at 11:46
  • Most likely reason here is that php-cgi simply cannot handle large loads due to its architecture. Use php-fpm. Commented Dec 2, 2016 at 18:47

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