How do I know if my firewall is blocking Meccha Chameleon?

Open Windows Security > Firewall & network protection > Allow an app through firewall. If Meccha Chameleon or its executable is not listed, the firewall is likely blocking it. You can also check by temporarily disabling the firewall and testing if the game connects.

Which ports does Meccha Chameleon use?

Meccha Chameleon uses UDP ports for P2P multiplayer. The exact ports are dynamically assigned, but you can allow the game executable through the firewall to bypass port-specific rules.

Is it safe to allow a game through the firewall?

Yes, as long as you only allow the official game executable from the Steam installation directory. Never allow unknown .exe files through your firewall.

Does Windows Defender Firewall affect Steam?

Yes. Windows Defender Firewall can block Steam's game overlay, voice chat, and P2P connections. Always allow both Steam.exe and the game's shipping executable through the firewall.

Fixing Firewall Blocks for Meccha Chameleon

Windows Defender Firewall and third-party antivirus/firewall software can block Meccha Chameleon’s network connections, preventing you from joining lobbies, hosting games, or connecting to the Steam overlay. This guide walks through allowing the game through every common firewall type.

Windows Defender Firewall (Most Common)

Allow the Game Through the Firewall

Press Windows Key + R, type firewall.cpl, and press Enter.
Click Allow an app or feature through Windows Defender Firewall on the left sidebar.
Click Change settings (requires admin).
Click Allow another app… at the bottom.

Click Browse and navigate to:

C:\Program Files (x86)\Steam\steamapps\common\MecchaChameleon\Binaries\Win64\

Select MecchaChameleon-Win64-Shipping.exe and click Open.
Make sure both Private and Public checkboxes are checked.
Click OK.
Also add Steam.exe from C:\Program Files (x86)\Steam\ using the same process.
Restart your PC and launch the game.

Allow via PowerShell (Advanced)

For a faster approach, run this in PowerShell as Administrator:

New-NetFirewallRule -DisplayName "Meccha Chameleon" -Direction Inbound -Program "C:\Program Files (x86)\Steam\steamapps\common\MecchaChameleon\Binaries\Win64\MecchaChameleon-Win64-Shipping.exe" -Action Allow -Protocol UDP -Profile Private,Public
New-NetFirewallRule -DisplayName "Meccha Chameleon" -Direction Outbound -Program "C:\Program Files (x86)\Steam\steamapps\common\MecchaChameleon\Binaries\Win64\MecchaChameleon-Win64-Shipping.exe" -Action Allow -Protocol UDP -Profile Private,Public

Third-Party Antivirus / Firewall

Norton / LifeLock

Open Norton.
Go to Settings > Firewall.
Click Program Controls or Program Rules.
Find Meccha Chameleon in the list and set it to Allow.
If it is not listed, click Add and browse to the game’s .exe file.

McAfee

Open McAfee.
Go to Firewall > Internet Connections for Programs.
Click Add and browse to the game’s .exe file.
Set the permission to Full Access.

Bitdefender

Open Bitdefender.
Go to Protection > Firewall.
Click Settings (gear icon) > Rules.
Click Add Rule and browse to the game’s .exe file.
Set File Permissions to Allow.

Kaspersky

Open Kaspersky.
Go to Settings > Protection > Firewall.
Click Manage Resources.
Add the game’s .exe file and set it to Allow.

Quick Test: Is the Firewall the Problem?

Temporarily disable your firewall:
- Windows Defender: firewall.cpl > Turn Windows Defender Firewall on or off > Turn off for both Private and Public
- Third-party: Right-click the tray icon > Disable temporarily
Launch Meccha Chameleon and try connecting to a lobby.
If it works, the firewall was blocking the game. Re-enable the firewall and add the rules above.
Never leave your firewall disabled permanently — it only takes a few minutes to add the proper allow rules.

For port-specific configuration, see the Port Forwarding Guide.

Firewall Blocking Game — Fix Guide

Quick answers