Okay, some players have difficulties get their dedicated servers to work. also valve´s tutorial isnt such beginner friendly. heres what i posted to alien swarm forums;
performance is somehow better on dedicated server than in "create server" (atleast on me)
Dunno about other players but should be smoother for them too. And most advantage for host itself ( example my fps over double than in "create server")
also dedicated doesnt require game being on. And theres much more options than in normal "create server" host.
tho valves tutorials may be little hard to understand.
I tell how to make it work.
heres valve´s tutorial for alien swarm dedicated server;
First download and install HldsUpdateTool (download link at that page) (anywhere to your computer you want to, i used c:\HldsUpdateTool. just create new folder)
after its done theres HldsUpdateTool.exe (thing with steam logo)
run it once to make sure you have latest version
Now create folder to you server. (example c:\alienswarmserver)
Then create shortcut for HldsUpdateTool.exe and place example to same folder. then right click that shortcut and select properties at down.
copy paste this to target:
C:\hlsupdatetool\HldsUpdateTool.exe -command update -game alienswarm -dir "c:\alienswarmserver"
After that double click that shortcut and it updates server files -it maybe take some time. depending on your net speed and is it first time you do it.
Now create server.cfg for configuring server settings. (example C:\alienswarmserver\swarm\cfg\server.cfg)
open it and type settings you want
Now go on steam tools page, right click alien swarm dedicated server and select properties. Then select set launch options...
and put this to there:
srcds.exe -console -game swarm +map lobby -maxplayers 4 -autoupdate
after that select ok.
Now you should rdy to play. start alien swarm dedicated server at tools page of steam. after that just start alien swarm and connect to your server.
it should be visible at right-down corner.
other way is to copy paste ip from server console. example with dedicated server browser--> add favorite server --> paste ip--> connect or just simply type connect (ip) to the console.
If theres happens stuff like players cant connect to your server it probably is caused cause ports arent open. tho they should be open if you are allowed network for alien swarm(/for asw dedicated?)
also if they can join to your "create server" it should be all right now. if you have tryed and failed using dedicated, its probably cause just non-updated server.
Making this requires some work but doesnt take such long. most time goes on waiting server updating. but its worth it, example cause better fps.
Ask if you have something to ask. Ill try my best to answer.
btw one feature is increased max amount of players^^ just change -maxplayers 6 instead of -maxplayers 4 to the launch options of alien swarm dedicated server.
Now go kill some aliens.
Ill think this should work on other games too. just change alien swarm paths example to css.