You cannot recover them but you can reset them as explained below:
· Stop Abyss Web Server if it is running.
· Open in a text editor (for example Windows Notepad, MacOS X Textpad, vi, GEdit or KEdit) the configuration file abyss.conf usually located in the Abyss Web Server installation directory.
· In the lines between <console> and </console>, locate the line enclosed between <password> and </password> and deleteit. This line should be made of a combination of letters and digits as in a5a3a15d71c3d07b94ef96a25c480737.
· Save abyss.conf and close the text editor.
· Start Abyss Web Server.
· Open the console. You will be asked to choose new access credentials.