Medium Operating Systems ✓ Solution Verified by Community (0+ upvotes)

Error Code error-port-message-too-long — Windows 11

ERROR_PORT_MESSAGE_TOO_LONG = 546

65% úspěšnost
👥 0+ uživatelů ověřilo
📅 Aktualizováno: 2026-08-12
⏱️ 15 min čtení
Oprava založena na komunitních zprávách a expertní analýze. Naposledy ověřeno: 2026-08-12 · Jak ověřujeme opravy
Error Codeerror-port-message-too-long
Affected SystemWindows 11 (Microsoft)
DifficultyMedium
Estimated Time15 min
Requires Admin Rights⚠️ Yes

Postup řešení

  1. 1 Press Windows key + R, type 'devmgmt.msc', and press Enter. In Device Manager, expand 'Ports (COM & LPT)'. Right-click the port you're using and select 'Properties'. Go to the 'Port Settings' tab and click 'Advanced'. Increase the 'Receive Buffer' and 'Transmit Buffer' values to the maximum (usually 4096). This gives the port more room to handle large messages.
  2. 2 If the error is from a specific application, check if the application has a setting to adjust the buffer size or message length. Look in the app's settings or configuration file for options like 'MaxMessageSize' or 'BufferSize' and increase them.
  3. 3 Open Command Prompt as administrator and run 'sfc /scannow' to repair any corrupted system files that might affect port drivers.
  4. 4 Update the driver for the port device. Right-click the device in Device Manager, select 'Update driver', and choose 'Search automatically for drivers'. If no update is found, visit the manufacturer's website for the latest driver.
  5. 5 If the problem persists, try using a different USB port or a different USB-to-serial adapter, as the hardware might have a small buffer.

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