alive.php in mu anyone heard of it?

I keeping getting an error like this in my logs from different IP. Anyone know what this is?

[error] [client 62.219.18.64] script '/vol/var/www/wordpress-mu/alive.php' not found or unable to stat
[Thu Feb 12 00:51:51 2009] [error] [client 66.249.71.90] Request exceeded the limit of 10 internal redirects due to probable configuration error. Use 'LimitInternalRecursion' to increase the limit if necessary. Use 'LogLevel debug' to get a backtrace.