Modular Combat for Half-Life 2

It can be confusing, but my tactic for all source games is this:

start a game
type in the console:
sv_lan 0
net_start
changelevel <mapname>

and then everyone else will be able to join, assuming you've forwarded the right ports on your router (check portforward.com for that)

hello there, I was doing the methode you showed for every Source game, BUT, with modular combat is just WON'T work =( I create a server, and all that (my ports ARE forwarded 100% sure), but when some one tries to connect to me: Class C error... This error is supposed to be corrected with sv_lan 0, but nothing happens =@... Do I need to install the server files? or its only for dedicated servers? If it is, I guess I extract it into my Source Dedicated Server directory, right? Thans for info...
Thanks a LOT
PS: what is the name of this mod for the command line? If I want to start the Source Dedicated server with a command line, like: "-game ??? -map "name of the map" -port 27015 -sv_lan 0 -ticrate 99 -maxfps 200" (something like that, I cannot confirm right away, because I need to reinstall Steam entirely to be sure)

The name of the mod in the command line is just the name of the mod folder, so in MC's case, its modularcombat. You absolutely should not need the server distribution for a listen server, they contain nothing different to the client distribution. I don't know of anything else to suggest regarding your hosting problems, if it works for hl2dm and TF2 (or something else on OB engine), then I don't know what to suggest.

Thanks a Lot, but the problem is STILL present?! I am 100% that not-OB engine are workign for me, but when it comes to OB games / mods like TF2 and MC, "Class C error" at all times O_O... I don't know what I am doing wrong, but just to be clear I will re-clarify the steps I take to host:
1st Example: Synergy;
*1) Make sure my ports are open on my router
*2) Ensure that nothing runs in my background that is Downloading something, so that the players have as less lag as possible.
*3) Start Synergy either with the command line using Source Dedicated Server tool, or directly in-game if it's a brief hosting.
*4) Look for my Internet IP adress, and give it to everyone that is intended of joining the server to avoid confusing and save some time looking for the server (I often host private games between friends only)
*5) Connecting to my own server, and Done

2nd Example: Modular Combat
*1) Ensure that ports are open
*2) Close everything in the background
*3) Fire up the server using in-game menu
*4) Re-type sv_lan 0 in the console (I already edited the server.cfg with sv_lan set to 0
*5) Restart the server with the map wanted
*6) Invite people
When they are joining "Class C" error =(... No idea what is wrong.
EDIT: I also edited few command lines in MC to gain XP faster, but this should not affect the class C error in any way.
EDIT2: Synergy is also OB engine mod, so OB mods should ALSO work...

Sure, just drop the console and type sv_lan 0

would it come with the next modular combat patch?

Depends how they're getting on. Some of the logic for modules (and for avoiding things like lasers) is a lot more complicated than anything they've done with omnibot before. That challenge is what made them want to bring it to MC in the first place, but it might mean that its longer before they're finished.

Currently bots play just like its hl2dm, and buy weapon upgrades. As far as I'm aware, they don't avoid lasers and magmines, or standing in front of turrets. These things would be pretty exploitable if we released them as they are.