Title: Connection Errors
Last modified: March 4, 2026

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# Connection Errors

 *  [Ben Brett](https://wordpress.org/support/users/bengali666/)
 * (@bengali666)
 * [2 months, 3 weeks ago](https://wordpress.org/support/topic/connection-errors-4/)
 * This looks to be a great plugin – especially as it includes the option to sync
   only users with specific roles.
   **_Unfortunately, I can’t get it to connect!_**
   I’ve tried on multiple sites but get a selection of error messages – always the
   same error message when trying to connect a site but different depending on the
   2 sites I am connecting.
 * 1st 2-site combination setup:
   **Connection Test Failed: cURL error 28: Operation
   timed out after 20001 milliseconds with 0 bytes received** – _when using the 
   admin Password_**Connection Test Failed: Authentication with provided Application
   Password failed. Server responded with status code 500.** – _when using the application
   Password_
 * 2nd 2-site combination setup (different sites):
   **Connection Test Failed: Failed
   to generate Application Password. Remote server returned HTTP status 403. Please
   check admin username/password and ensure Application Passwords are enabled on
   the target site.** – _when connecting to the ‘parent’ site with admin password._
 * **Connection Test Failed: Authentication with provided Application Password failed.
   Server responded with status code 403. Please check the username and Application
   Password. Ensure the Application Password is not revoked on the target site.**–
   _when connecting to the ‘parent’ site with application password._
 * **Connection Test Failed: cURL error 28: Connection timed out after 10000 milliseconds**–
   _after adding whitelist authentication to the target site._
 * Usernames and passwords have been double checked and application passwords are
   enabled. Application passwords were created and tried with/without the spacing
   between the 4 letter combinations.
   Any suggestions?

Viewing 1 replies (of 1 total)

 *  Thread Starter [Ben Brett](https://wordpress.org/support/users/bengali666/)
 * (@bengali666)
 * [2 months, 3 weeks ago](https://wordpress.org/support/topic/connection-errors-4/#post-18841097)
 * I have now setup 2 fresh WP test sites with only this plugin installed. Both 
   are publically accesible but I get the following when trying to connect using
   either admin or application password:
 * **Connection Test Failed: Failed to generate Application Password. Remote server
   returned HTTP status 404.**

Viewing 1 replies (of 1 total)

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 * 1 reply
 * 1 participant
 * Last reply from: [Ben Brett](https://wordpress.org/support/users/bengali666/)
 * Last activity: [2 months, 3 weeks ago](https://wordpress.org/support/topic/connection-errors-4/#post-18841097)
 * Status: not resolved