Odd one this.
In my dev installation, the homepage of the public site is being re-directed to the CMS login screen. It has only recently started doing this after months of no problems.
It doesn't do this in my production installation, and the codebases are the same.
I've checked the Access tabs of the main 'site' node and the homepage beneath it. The 'site' node says "Anyone can view pages on this site", and the homepage inherits its permissions from its parent.
Other pages on the site can be accessed without problem, it's just the homepage that has issues.
I've re-built, flushed, cleared caches and pretty much kicked the PC, but can't stop it re-directing.
Of course, if I log-in to the CMS, it allows me to see the homepage.
Anyone got any ideas?