KiwEric

Thanks for your suggestion gaurabmani, I have checked permissions on all files and folders and ensured that folders are set to 755 & files to 644.

This appears to have made no difference. i.e. After a few hours the Add-on domain itself gives a 404 error when called (subsequently the blog itself does likewise).

Immediately after the first attempt to load the site and getting the 404 error I accessed the site via my ftp program and rechecked the permissions for both files and folders. They remain unchanged at folders 755 and files 644, at this stage I once again deactivated the blog by renaming the folder but the add-on domain itself still gives a 404 error. I checked pretty much hourly before going to bed for the night and still kept getting 404 error. The following morning for the first couple of hours I was still getting a 404 but midway through my morning (around 11:00 am) the add-on domain site started to load correctly. Given the fact that I am located in the southern hemisphere and I suspect the server is likely to be somewhere in the northern hemisphere, it seems logical to me that the server is resetting at or soon after midnight and with the blog deactivated the add-on domain begins to function correctly again following the server reset.

Hence I am no closer to resolution at this stage.

Any other suggestions please ?

Regards

Eric