Ok, got the webadmin working, authenticating against my 
username and pass, just fine, but the strange this is, after I 
login, none of the images in the admin header work, I just get 
the standard red x's as if the image didn't exist, plus another 
problem with 404's below). I checked my config and here's the 
relevant WebServer portion: 

[UWeb.WebServer] 
Applications[0]=xWebAdmin.UTServerAdmin 
ApplicationPaths[0]=/ServerAdmin 
Applications[1]=xWebAdmin.UTImageServer 
ApplicationPaths[1]=/images 
DefaultApplication=0 
bEnabled=True 
ListenPort=8888 

I didn't change anything there except add ListenPort 
and set bEnabled to true (which made it work). I tried 
going to http://myip:8888/images/h_logo.jpg (which is 
the first image file) and I get the page not 
found thing, but the images folder is clearly there in the Web 
folder off the game's root. Everyone has read and execute 
permissions to the entire folder, so it's definetly not permissions, 
and I even tried copying the images folder into the ServerAdmin 
folder and changing the above pathing, no luck. 

Also, certain pages give 404 errors, but they are there in the 
ServerAdmin folder, I think it has something to do with the .htm 
extension or something, but here's the order of links that return 
404's (starting from top menu), these all appear in the right 
frame: 

Current -> Server Console -> (Wait 5 Seconds) 404 Error 
Current -> Bots -> 404 Error 
Defaults -> 404 Error 
Defaults -> Maps -> 404 Error 
Defaults -> Bots -> 404 Error 
Defaults -> Game -> 404 Error 
Defaults -> Rules -> 404 Error 
Defaults -> Server -> 404 Error 
Admin & Groups -> Your Account -> 404 Error

I start the server with:

./ucc server BR-Anubis.ut2?XGame.xBombingRun?AdminName=admin?
AdminPassword=admin -nohomedir -ini=Server.ini -log=server.log