If Call of Duty: Modern Warfare disconnects with “Disconnected due to transmission error,” there is no verified fix for this exact message that works for everyone. First check Activision and your platform’s service status. If services are available, test your connection, then try the repair steps for your platform. The message alone does not reveal whether the problem is an outage, your network, or local game files.
Start by checking whether services are available
Before changing your router or deleting game files, check the Modern Warfare support page for service alerts and the current Known Issues listing, then check your console or PC platform’s network status. If there is a disruption, wait for service to return and try again; local troubleshooting cannot resolve an outage. Activision’s listing showed a Known Issues update dated June 21, 2024, but that listing alone does not establish whether this exact error is included.
Players report seeing the message during matchmaking or while a map loads, including after “Match Started. Loading Level…” Those circumstances do not identify the cause.
Test your connection before changing router settings
Activision’s connection guide, updated October 27, 2019, covers general connectivity problems rather than this specific error. Its console instructions are from the PS4 and Xbox One era, so current menu names may differ. Use your platform’s network or multiplayer connection test and note any reported failure.
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- If you are on Wi-Fi, try connecting the console or PC to the router with Ethernet if practical. Activision Support wrote, “We strongly recommend using a wired Ethernet connection.” This is general online-play advice, not a guaranteed fix for this error.
- Restart your router, then test the game again.
- Pause downloads, streams, and other bandwidth-heavy activity on your network while testing.
Make one change at a time and retry after each one. That makes it easier to tell whether the change affected the disconnection.
Change router settings cautiously
If the platform’s connection test or repeated disconnects point to a network issue, Activision’s connection guide describes router options including UPnP and port forwarding. Treat these as separate tests, not settings to enable together by default. Router interfaces vary; follow your router manufacturer’s or ISP’s instructions rather than guessing.
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The same guide lists DMZ testing for consoles. If you try it, Activision specifically says to remove the console’s static IP from DMZ after the test. Do not leave a temporary router configuration in place without understanding its effect.
On PC, repair the game files
If services are available and the connection test does not reveal a problem, use the repair option in the launcher where you own the game. Activision’s PC troubleshooting guide, updated October 27, 2019, gives these options:
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- Battle.net: use the launcher’s Scan and Repair option for Modern Warfare.
- Steam: use Steam’s file-integrity verification option for the game.
Activision also advises checking for background software that may interfere with the game. If you suspect antivirus interference, its guide recommends adding the game folder to the antivirus exception list. Only do so if you trust the game installation and understand how to add a folder exception in your antivirus software.
Treat pack and configuration-folder workarounds as unverified
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A historical Driver Easy article suggests removing older Xbox multiplayer data packs and installing named replacements. This is third-party advice, not a fix confirmed by Activision for this error. Content-pack names and installations can change with game updates; only consider the steps if the relevant packs appear in your installed game and you have checked current instructions. Do not remove packs based on an outdated name alone.
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PC Players folder
One Reddit user reported that deleting the PC Players folder helped with map-loading disconnections. That is one anecdote, not a validated fix. Deleting configuration data may reset local settings, so preserve your settings first and try the launcher’s file repair before considering this.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.When to contact your ISP
If the platform’s network test fails or Activision’s connection steps do not resolve broader connectivity trouble, contact your internet service provider. If the connection works normally but Modern Warfare still disconnects, avoid assuming that the message proves a router or file problem: the reviewed official guidance does not diagnose this exact error.
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