Xdebug config issues - Connection with 'xdebug 2.5.0rc1' was not established


I've read a couple of posts relating to this error message and tried one or two things without any success. I am getting the message "Connection with 'xdebug 2.5.0rc1' was not established. Validation Installation" when I run debug in PHPStorm. I then get the 'Debug extension settings was updated. Please re-run current configuration to use new values..'. Any help would be appreciated.

Debug runs but it runs all the way through to the end of the script without stopping at any of the breakpoints. I've set the interpreter as the php.exe file in xampp which is 5.6.28

See my php.ini config:

zend_extension = C:\xampp\php\ext\php_xdebug-2.5.0rc1-5.6-vc11.dll

As you can see they are all commented out apart from the top 2 but I have tried various combinations using the commented out lines in conjunction with the others.

See phpinfo:

xdebug support enabled
Version 2.5.0rc1
IDE Key jonat
Supported protocols Revision
DBGp - Common DeBuGger Protocol $Revision: 1.145 $
Directive Local Value Master Value
xdebug.auto_trace Off Off
xdebug.cli_color 0 0
xdebug.collect_assignments Off Off
xdebug.collect_includes On On
xdebug.collect_params 0 0
xdebug.collect_return Off Off
xdebug.collect_vars Off Off
xdebug.coverage_enable On On
xdebug.default_enable On On
xdebug.dump.COOKIE no value no value
xdebug.dump.ENV no value no value
xdebug.dump.FILES no value no value
xdebug.dump.GET no value no value
xdebug.dump.POST no value no value
xdebug.dump.REQUEST no value no value
xdebug.dump.SERVER no value no value
xdebug.dump.SESSION no value no value
xdebug.dump_globals On On
xdebug.dump_once On On
xdebug.dump_undefined Off Off
xdebug.extended_info On On
xdebug.file_link_format no value no value
xdebug.force_display_errors Off Off
xdebug.force_error_reporting 0 0
xdebug.halt_level 0 0
xdebug.idekey no value no value
xdebug.max_nesting_level 256 256
xdebug.max_stack_frames -1 -1
xdebug.overload_var_dump 2 2
xdebug.profiler_aggregate Off Off
xdebug.profiler_append Off Off
xdebug.profiler_enable Off Off
xdebug.profiler_enable_trigger Off Off
xdebug.profiler_enable_trigger_value no value no value
xdebug.profiler_output_dir \ \
xdebug.profiler_output_name cachegrind.out.%p cachegrind.out.%p
xdebug.remote_addr_header no value no value
xdebug.remote_autostart Off Off
xdebug.remote_connect_back Off Off
xdebug.remote_cookie_expire_time 3600 3600
xdebug.remote_enable On On
xdebug.remote_handler dbgp dbgp
xdebug.remote_host localhost localhost
xdebug.remote_log no value no value
xdebug.remote_mode req req
xdebug.remote_port 9000 9000
xdebug.scream Off Off
xdebug.show_error_trace Off Off
xdebug.show_exception_trace Off Off
xdebug.show_local_vars Off Off
xdebug.show_mem_delta Off Off
xdebug.trace_enable_trigger Off Off
xdebug.trace_enable_trigger_value no value no value
xdebug.trace_format 0 0
xdebug.trace_options 0 0
xdebug.trace_output_dir \ \
xdebug.trace_output_name trace.%c trace.%c
xdebug.var_display_max_children 128 128
xdebug.var_display_max_data 512 512
xdebug.var_display_max_depth 3 3
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xdebug 2.5 RC1 does not work for me either (tested only with PHP 5.6.28 x32 nts and PHP 7.0.13 x32 nts on Windows 10 Pro x64). But 2.4.1 works just fine with both of them.

Xdebug tickets on similar issue:

Seems like only Windows affected, regardless of the IDE used.

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i've same problem, when I installed new php71. 

The main problem is, that old xdebug was still listening on same port 9000. 

Set in xdebug.ini port xdebug.remote_port=9071 and then in Phpstom in sections PHP/Debug, section Xdebug, debug port = 9071. 

Optinally (if u use debug proxy), change it also in section DBGp Proxy to 9071.


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@Jan Machala

Not your case.

OP was working with XAMPP on Windows and was using xdebug 2.5.0rc1 which has issues on Windows (as indicated by xdebug tickets). xdebug 2.5.0 final has them resolved.

About your case... sounds like you are running php-fpm .. which communicates with web server on the same port as xdebug (TCP 9000) -- at least this is the case for typical nginx + php setup on Linux/Mac (regardless of PHP version used -- applies to PHP 5.6 as well). I do not remember seeing notes where it would state that PHP 7.1 from now will use TCP 9000 for own stuff so xdebug have to use other ports instead...

If you are referring to running multiple php/xdebug versions at the same time -- right now I do not see why they could not use the same port .. as it's xdebug that connects to client (PhpStorm in our case).

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Not my case Andry,

I'm running php-cli, port 9000 is used exclusively by xdebug.

Changing port worked for me, by the root cause was probable somewhere else. 

Sorry for input not related input.


Jan Machala

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Is this a problem for OSX too?

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My problem was on OSX.

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The issue that OP had was Windows specific and appeared for xdebug 2.5.0RC1 only

In your case it most likely completely different thing -- try different xdebug port (as you may have conflict with php-fpm (which uses the same TCP 9000 port by default) .. which is more common these days on Mac/Linux)

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have same problem, solved by @Jan Machala's solution(OSX10.12.2 &  phpstrom2016.3.2  & php71-xdebug ) 

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default php-fpm is auto start when login. and php-fpm occupy 9000 port, so i config xdebug with 9001 port, then everything work fine.









% lsof -i :9000                                                          


php-fpm 476 LeBlanc    6u  IPv4 0xeaf2c42a024ae48b      0t0  TCP localhost:cslistener (LISTEN)

php-fpm 493 LeBlanc    0u  IPv4 0xeaf2c42a024ae48b      0t0  TCP localhost:cslistener (LISTEN)

php-fpm 954 LeBlanc    0u  IPv4 0xeaf2c42a024ae48b      0t0  TCP localhost:cslistener (LISTEN)

% lsof -i :9001                                                          


phpstorm  968 LeBlanc  363u  IPv4 0xeaf2c42a0305748b      0t0  TCP *:etlservicemgr (LISTEN)

phpstorm  968 LeBlanc  449u  IPv4 0xeaf2c42a0305aa5b      0t0  TCP localhost:etlservicemgr->localhost:49893 (ESTABLISHED)

php      1088 LeBlanc   12u  IPv4 0xeaf2c42a024b086b      0t0  TCP localhost:49893->localhost:etlservicemgr (ESTABLISHED)

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@ Jan Machala's solution worked for me too, also on macOS. Not really sure what was preventing port 9000 from working, and it actually all worked in the browser, just not in debug. Anyway, thanks!

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OMG THANK YOU SOO MUCH. I LITERALLY  just spent 12 hrs trying to fix this problem... AND THIS MAKES NO SENSE CUZ ALL OF THE ONLINE TUTORIALS ARE WRONG!!  (about port 9000) I Hope we as a  community can fix this.  My brain is officially fried now... I'm gonna take a nap and dream of world where problems like this don't keep me up at night lol.


-Thank you.   

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I had this error and changing the port xdebug was running on and then changing the setting in PHPstorm that it was listening for xdebug on. this solved the problem for me.

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Please close this thread.

Original issue was very specific (specific xdebug build on Windows platform) and it was quite long time ago (and affected maybe 2-3 weeks span till newer build became available).

All other comments have no relation to the original issue. No need to mix them up in one place -- better use separate/other threads instead.


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