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Thanks for asking.
This message and page are not coming from Remote Buddy, but from a webserver package called MAMP PRO (http://www.mamp.info/) you appear to have installed previously.
Please note that Remote Buddy doesn't come with or use MAMP PRO. Remote Buddy implements AJAX Remote using its own, unique webserver RapidHTTPD.
Solution A:
1) Uninstall MAMP PRO and reboot.
Solution B:
1) Please make sure you've entered the full URL (including the port number 8888).
2) If you have and you get the MAMP PRO page, you installed MAMP PRO to use the same port
3) In this case, please go to Remote Buddy > Prefs > AJAX Remote and change the port to something different - f.ex. 8889 or 5555. You may have to disable/enable the AJAX Remote using the checkbox at the top for this change to take effect.
4) Enter the new URL supplied by Remote Buddy into your browser
Best regards,
Felix Schwarz