I can play in "official" servers without any issue (like competitive match/casual etc). but when I go into a custom server, after few seconds it shows this error: "Warning: Connection problem, Auto-disconnect in: 00:25 seconds". enter image description here

I tried to verify files, reinstall game.. it didn't fix.

  • Are you on WIFI? And does the same error appear on wired connections too?
    – dly
    Commented Aug 16, 2021 at 8:34
  • @dly I am not on WIFI, using wired connection. I cannot try with WIFI (PC).
    – purify
    Commented Aug 16, 2021 at 11:49

1 Answer 1


This is what Steam says about this issue:

Exit Steam.

Please open Internet Explorer, Safari or Firefox and type steam://flushconfig then press Enter. (If asked to allow this website to open a program, please click 'Allow' or 'OK')

When prompted by Steam to reset your configuration, please click 'OK' to confirm.

Once done, login to Steam and re-test the issue.

If you have multiple installation folders for games doing this process will remove them. You will need to add the folders again in Steam so that your games will appear as installed.

In order to add the folders please do the following:

  1. Open Steam
  2. Click Steam > Settings (Preferences on Mac)
  3. Navigate to the 'Downloads' tab
  4. Click the 'Steam Library Folders' button
  5. Click on 'Add Library Folder' and add the directory that contains your games
  6. Click 'OK'
  7. Restart Steam

If the issue persists, make sure your network is optimized for Steam. Check the network troubleshooting support page, especially the ports section. Also some ISPs have trouble with Steam:

  • 012.net (Steam traffic blocked)
  • Bluewin (Firewall blocks Steam from provider side - must be disabled through provider's service portal)
  • Dutch Telecom (Steam traffic blocked)
  • ISPFree (Steam traffic blocked)
  • Micronet Broadband (Steam traffic blocked)

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