If I have a server farm with real servers listening on port 8888 and I apply an HTTP-type health probe with no port number specified, will the ACE know to probe the servers at 8888 or will it try to probe port 80?

I'm getting a lot of bots hitting my site. Log entries are very similar (except for the source IP):1.247.32.58 - - [11/Dec/2012:22:57:03 -0800] "POST  /?ptrxcz_Ah5qDayLi6TrEbzVtPwSqMtGmJgDa7 HTTP/1.1" 403 3985 "-" "Mozilla/4.0  (compatible; MSIE 6.0;...

I've got 2 servers in a server farm on round robin load balancing set up. Right now, it load balances requests to www.abc.com. I would like all requests for www.abc.com/admin to go to server A all the time. What's the best way of accomplishing this? ...