COD4x mod & server for Call of Duty 4 MW2 - Freezetag

[iboomboom]

On 5/22/2026 at 10:13 AM, iboomboom said:

@Ruggerxi will put the client on our XI website for download. In the meantime, you can download it from a test server that we host.

Manual Installer: http://74.91.119.86/cod4xclient/cod4xclient.zip 
Automated Installer: http://74.91.119.86/cod4xclient/CoD4x.21.3.Setup.zip

This server doesn't have a SSL certificate so your browser will freak out about "insecure" download. It's fine, press "Keep". I put it there, if anything you will get some of my hacks, J/K.

I am not able to modify the original post, there was a linking error here's the fixed link.
http://74.91.119.86/cod4xclient/CoD4x.21.3.Setup.zip Thank you @srt4fun for hosting the files on your server too. 

 

Rugger made a post here, you can download the files from the forum as well. @Sitting-Duc can we host this on our webserver behind a SSL powered URL?

 

Edited May 23 by iboomboom

[iboomboom]

A few updates that are in test.

- Flak jacket protective power is reduced my 10%
- Tubes and RCXD explosive damage is reduced by 15%

Known issues:

- If you play the game thru steam and change your nickname it might not work the way you think.

- To change your name /name MyNewName followed by /reconnect in your console - this works if you have the game installed via the disc

 

[pitbullpete]

I was in the new server no issues except my call name pitbullpete doest show instead it's using my steam ID any way to fix this

[iboomboom]

This is a known "issue", I need to investigate what exactly is different about Steam. Basically COD4x client creates a new profile for you.

any volunteers to troubleshoot this live? I don't have Steam. 

[iboomboom]

39 minutes ago, pitbullpete said:

I was in the new server no issues except my call name pitbullpete doest show instead it's using my steam ID any way to fix this

If you're around, please try again, I tried a setting I am hoping that helps with this.

[pitbullpete]

I was able to change my profile name in steam

[Dukoo]

i got the game trough steam also, but i made a desktop shortcut to multiplayer, since then i have no issues anymore with chancing a name because steam doenst startup when you open multiplayer ( at least not from my end ) it shut be something you could give a try and see if that fixes the issue. 

[Sgt Wacky]

I am getting 10-15 delays on map changes which is significantly different for pre-game changes. I am also  experiencing delays in game play where I am shot and die then I see the player doing the shooting. Similarly of opposing player coming around corners. This was also not my experience prior to these changes.  I have changed nothing in my computer set up. I aim , fire ...sometimes multiple shots directly on target and die by a single shot with great frequency.  In close combat I routinely shoot first and virtually alway die immediately.  Playing now is getting pointless.  An suggestions on how to fix this????

I am running i7-13700kf processor, 32 gb ram, 12 gb video , rtx 4070   ISP...2375 mbps down and 2280 mbps up. 

[iboomboom]

55 minutes ago, Sgt Wacky said:

I am getting 10-15 delays on map changes which is significantly different for pre-game changes. I am also  experiencing delays in game play where I am shot and die then I see the player doing the shooting. Similarly of opposing player coming around corners. This was also not my experience prior to these changes.  I have changed nothing in my computer set up. I aim , fire ...sometimes multiple shots directly on target and die by a single shot with great frequency.  In close combat I routinely shoot first and virtually alway die immediately.  Playing now is getting pointless.  An suggestions on how to fix this????

I am running i7-13700kf processor, 32 gb ram, 12 gb video , rtx 4070   ISP...2375 mbps down and 2280 mbps up. 

Can you join some other server relay if you have the same issue? I cannot understand what you are saying. 10-15 second delay before map changes? You get shot then see the other person shooting? 

[iboomboom]

COD4x Server Address 

74.91.119.86:28960

I want to thank everyone for their patience in playing on the CoD4x server and suffering thru the crashes and reboots. I care deeply about our clan and everyone I play with, hence, my motivation to dedicate my time and put in the effort to make this happen.

 

Retrospect 

When we first launched the CoD4x server it was on a managed NFO server, meaning all the server controls are with NFO, just put the mod files in there. The server was crashing due to fundamental changes in how the CoD4x code is re-written and how our mod handles player data. We had no way of figuring out what was wrong since we had no control over the server's internal behavior. I decided to launch the CoD4x server on a dedicated machine where I had absolute control over the server process. I recompiled the CoD4x server code and launch binary after binary. Each iteration informed by the logs collected when the server crashed. On the Linux machine I was able to capture the exact behavior of the server and put guard rails against crashing, but didn't address the root-cause.  Until now.

I have strong confidence in the latest deployment that I have addressed the root-cause of the crashes. A bug in memory handling that becomes bigger and bigger as people join and leave the server. When a map changes it causes corruption and crashes the server. It took all of this to get to the bottom of this problem. The work arounds I put in, would delay the inevitable and one of the work arounds had a sever-side side effect. People with lossy connections @Icequeen@Dukoo @P1nh3ad or well high ping, would experience stuttering, this was real, caused by the bug, but made worse by the work around I put in to keep the server from crashing right away. I am confident that you will not experience this anymore.

If you know programming, I had to patch the disassembly of the stock COD4 server and recompile the CoD4x server code. Our mod does a double free of player data. This happens on the stock server too but the stock server is single threaded so while it never crashes it starts becoming laggy the longer it stays on. We change rotations every Friday so a server restart would clean the slate. The CoD4x server launches multiple threads, and does things in parallel, when the mod's code would try to delete player data upon disconnect, it would do that more than once in CoD4x, this would poison the memory heap. The only solution was to block the call in the server code. CoD4x automatically deletes all the pertinent player data on disconnect, the mod doesn't need to send that command in the script. This is in essence a two-part fix, put a check in the server code to don't let the memory get poisoned then remove all the player data delete from the mod's scripts/code. At the moment, I don't have the mod's source code so I did the only and the best thing I could. 

 

I hope the server's clock-work like crashes are behind us and all my hard work and sleeplessness has paid off. There will still be small things here and there but we will address them as we go. Thank you for reading and happy gaming. 

[YACCster]

On 5/28/2026 at 12:35 AM, Dukoo said:

i got the game trough steam also, but i made a desktop shortcut to multiplayer, since then i have no issues anymore with chancing a name because steam doenst startup when you open multiplayer ( at least not from my end ) it shut be something you could give a try and see if that fixes the issue. 

Same here, this is what I do and didn't have any issue with naming at all.

[Dukoo]

So i  also found out that after the lagging started i swapped a couple of times back to desktop with ALT+TAB and somehow going back and forward a couple of times sorted out the lagg issue going from left to right looking with the mouse caused less issues that way. The c4x mod is slightly more heavy weight. If somehow you already have issues make sure that all running programms in the right down corner are shut down, this reduces issues magnificently!  
I wanted to check out to see if running background programs could cause such issues and installed a very lightweight and simple animated custom crosshair the outer ring is constantly turning around making sure the process for it had to use some of my memory being able to keep spinning,  also this magnificently increased the usage of memory during gameplay and caused instant stuttering looking from left too right, i wanted to proof that running background processes can harm your gameplay preformances and so it did. I am not a cod4 programmer but this might be something too look into seeing if any of these things could be inproved within the c4x area mod. 
It might be usefull somehow to look into. 

So far my findings
Piece out. 

[Dukoo]

Also i noticed a couple of players not being able to pick their classes and come in game with no gun and they cannot pick any classes, even after resetting their classes no succes, is there any known cure for this? I remember when we had this mod running YEARS ago we had similar issues with this, but i cannot remember how we has this problem fixed. 

[Totty]

20 minutes ago, Dukoo said:

So i  also found out that after the lagging started i swapped a couple of times back to desktop with ALT+TAB and somehow going back and forward a couple of times sorted out the lagg issue going from left to right looking with the mouse caused less issues that way. The c4x mod is slightly more heavy weight. If somehow you already have issues make sure that all running programms in the right down corner are shut down, this reduces issues magnificently!  
I wanted to check out to see if running background programs could cause such issues and installed a very lightweight and simple animated custom crosshair the outer ring is constantly turning around making sure the process for it had to use some of my memory being able to keep spinning,  also this magnificently increased the usage of memory during gameplay and caused instant stuttering looking from left too right, i wanted to proof that running background processes can harm your gameplay preformances and so it did. I am not a cod4 programmer but this might be something too look into seeing if any of these things could be inproved within the c4x area mod. 
It might be usefull somehow to look into. 

So far my findings
Piece out. 

I use a crosshair on my monitor and also run the game directly from IW3mp.exe rather than through steam, even though it's a steam game.

My pc is old and needs updating but runs the COD4x serrver very smooth

[iboomboom]

5 hours ago, Dukoo said:

So i  also found out that after the lagging started i swapped a couple of times back to desktop with ALT+TAB and somehow going back and forward a couple of times sorted out the lagg issue going from left to right looking with the mouse caused less issues that way. The c4x mod is slightly more heavy weight. If somehow you already have issues make sure that all running programms in the right down corner are shut down, this reduces issues magnificently!  
I wanted to check out to see if running background programs could cause such issues and installed a very lightweight and simple animated custom crosshair the outer ring is constantly turning around making sure the process for it had to use some of my memory being able to keep spinning,  also this magnificently increased the usage of memory during gameplay and caused instant stuttering looking from left too right, i wanted to proof that running background processes can harm your gameplay preformances and so it did. I am not a cod4 programmer but this might be something too look into seeing if any of these things could be inproved within the c4x area mod. 
It might be usefull somehow to look into. 

So far my findings
Piece out. 

 

4 hours ago, Totty said:

I use a crosshair on my monitor and also run the game directly from IW3mp.exe rather than through steam, even though it's a steam game.

My pc is old and needs updating but runs the COD4x serrver very smooth

You use a software crosshair overlay? And you get stutter when the overlay is active? 

Press Enter to select a class.

[Totty]

7 hours ago, iboomboom said:

 

You use a software crosshair overlay? And you get stutter when the overlay is active? 

Press Enter to select a class.

My monitor runs my crosshair not my PC.

I have no issues with the gameplay

[iboomboom]

48 minutes ago, Totty said:

My monitor runs my crosshair not my PC.

I have no issues with the gameplay

Ah, I misread. You hacker.

[SPAM]

First off! Thank you BoomBoom for all the hard work you've been putting into this. Hoping you get some much deserved rest. 
Started off very stable this AM through a few quick rounds and not too many folks. So I'm sure not enough to push the mem.

Got this. And could not join. Assuming it's a map I don't have but would not auto download as usual. 

[wingnut]

i cant get in , show saw bipod mp mismatch weapon

 

[Dukoo]

13 hours ago, iboomboom said:

 

You use a software crosshair overlay? And you get stutter when the overlay is active? 

Press Enter to select a class.

That is correct, stutter starts with background processes but only on this mod. i tested the same thing on the other server, old server, and no issues there, no lagg, no high ping, no nothing. it's all causing issues on this new server

[wingnut]

24 minutes ago, wingnut said:

i cant get in , show saw bipod mp mismatch weapon

 

i joined old server then tried new one and got in ok, think it was because ive been on some other servers

Edited June 6 by wingnut

[iboomboom]

2 hours ago, SPAM said:

First off! Thank you BoomBoom for all the hard work you've been putting into this. Hoping you get some much deserved rest. 
Started off very stable this AM through a few quick rounds and not too many folks. So I'm sure not enough to push the mem.

Got this. And could not join. Assuming it's a map I don't have but would not auto download as usual. 

Delete the map files in your local folder and try joining again.