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This seems to be a PhpStorm EAP trait -same thing happened to me with 2020.3.

This is the php.ini config that worked for 2020...

[Xdebug]
zend_extension = /usr/lib64/php/modules/xdebug-3.0.2.so
xdebug.remote_enable = on
xdebug.remote_autostart = 0
xdebug.remote_connect_back = 0
xdebug.remote_host = 127.0.0.1
xdebug.remote_port = 9001
xdebug.remote_handler = dbgp
xdebug.remote_mode = req
xdebug.remote_log = /var/log/xdebug.log
xdebug.show_local_vars = 9
xdebug.profiler_enable = 1
xdebug.profiler_output_dir = /var/log
output_buffering = off

...and this is what I am trying to use with 2021:

xdebug.remote_log = /var/log/xdebug.log
xdebug.show_local_vars = 9
xdebug.profiler_enable = 1
xdebug.profiler_output_dir = /var/log
output_buffering = off
xdebug.mode = debug
xdebug.start_with_request=yes
xdebug.discover_client_host = true
xdebug.client_host = 127.0.0.1
xdebug.client_port = 9001
xdebug.start_with_request=yes

PhpStorm's ports are set as 9001 and 9003. I'm up the walls again. Any ideas, please and thank you?

LazyOne
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PepinhoDoSamba
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  • Please share more details - what do you do to trigger that error? – Nico Haase Feb 16 '21 at 15:38
  • Forgot that, sorry. I am trying to debug very simple MariaDB-PDO queries with PHP. It fails even for seven-year-old queries so the issue is not there. – PepinhoDoSamba Feb 16 '21 at 15:43
  • Please edit your question to contain all information. I don't understand what you are trying to do, and where **exactly** anything is not working as expected – Nico Haase Feb 16 '21 at 16:01
  • Nico Haase, I am just trying to make PhpStorm 2021.1 make a connection with Xdebug using on Fedora Linux. It couldn't be any simpler and it gets debugged just fine in the command line box so the problem doesn't seem to be PHP or Xdebug-related. Now PhpStorm says it cannot start debugger session with Xdebug 3.0.2 or 3.0.0. Remember than I'm using an EAP version of PhpStorm. – PepinhoDoSamba Feb 16 '21 at 16:30
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    Please add all clarification to your question by editing it. I'm using PhpStorm 2020.3.2 with XDebug 3 without any problems - have you tried checking if PhpStorms [debugger validation](https://www.jetbrains.com/help/phpstorm/validating-the-configuration-of-the-debugging-engine.html) provides any more details? – Nico Haase Feb 16 '21 at 16:58
  • Yes, I ran the validation several times beore writing and finally the connection was made and PhpStorm/Xdebug are working as expected but now I get PDOExceptions on very old code. Since it's an unfinished product I don't think it deserves any more trouble until I can get more information from it. I will write again if I get stuck again. Thanks for your help and your time. – PepinhoDoSamba Feb 16 '21 at 17:03
  • @PepinhoDoSamba 1) You are using Xdebug v3 ... but keep using v2 param names. They do almost NOTHING in v3. Please check https://xdebug.org/docs/upgrade_guide 2) *"PhpStorm's ports are set as 9001 and 9003"* Try changing that so only 1 port is listed there. 3) https://learnxdebug.com/ ; https://www.youtube.com/watch?v=IN6ihpJSFDw – LazyOne Feb 16 '21 at 18:48
  • Hi, LazyOne. You already helped me in November with a similar issue. The current issue is fixed now because I changed, as you suggest, the Xdebug params to v3 after I started this thread. Anyway it is peculiar that PhpStorm 2020 did work with v2 param names for over a month (I didn't know about param name changes until yesterday) Thanks for learnxdebug.com!! – PepinhoDoSamba Feb 17 '21 at 20:53

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