502 Bad Gateway with Zend Debugger (nginx+php5-fpm) and PHPStorm

Question

I'm trying to set up the debugging on a server but it won't work.

Here is my setup:

• Nginx with PHP 5.5.9 (fpm, unix socket) @ 192.168.1.40
• Network share with source code @ 192.168.1.50
• The network share is mounted on the webserver at /shared/www/
• My project is located under /shared/www/myProject and get accessed by http://myProject.local/
• Zend Debugger is installed, the following is from the php.ini:

  zend_extension="/usr/lib/php5/20151104/ZendDebugger-5.5.x-64bit.so" zend_debugger.allow_hosts=192.168.1.0/24,127.0.0.1 zend_debugger.expose_remotely=always

• The website is working as intended and I don't have problems there.
• My workstation has the IP 192.168.1.10

Now my PHPStorm settings:

File -> Settings -> Languages & Frameworks -> PHP

• PHP language level 5.5
• Interpreter: 192.168.1.40 (I get correct PHP-Version; Debugger: Zend Debugger, correct configuration file)

File -> Settings -> Languages & Frameworks -> PHP -> Debug

• Zend Debugger port = 10137
• [x] Can accept external connections

File -> Settings -> Languages & Frameworks -> PHP -> Server

New server added: 192.168.1.40:80 - Zend Debugger

[x] Use path mappings: File/Directory: \192.168.1.50\shared\www\myProject

Absolute path on the server: /shared/www/myProject

I've configured zDebug for Chrome this way:

• Debug Host: 192.168.1.10
• Debug Port: 10137
• [x] Check for Zend Debugger Cookie
• [x] Use Fast File
• [x] Debug Local Copy
• [x] Disable Right-Click

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Now with the config out of the way here is my problem with the debugging:

If I click on "Debug this page" (doesn't matter if I use the marklets or the Chrome extension) the site loades a minute or so and I'm getting a 504 Gateway Timeout from nginx.

Now if I click on the "Start Listening for PHP Debug Connections" (for zero-config debugging) and try the debug again, I'll get instantly a 502 Bad Gateway.

I really have no idea why I'm getting this error. Nginx error logs say this:

2015/11/04 18:11:05 [error] 4613#0: *107 recv() failed (104: Connection reset by peer) while reading response header from upstream, client: 192.168.1.10, server: 192.168.1.40, request: "GET /index.php HTTP/1.1", upstream: "fastcgi://unix:/var/run/php5-fpm.sock:", host: "192.168.1.40"

If I disable the debugging there is no error at all.

Does someone has any ideas about this problem? I've searched all PHPStorm documentation but to no avail.

Thank you!