Call of Duty 21 (COD 21) is a massive hit in the shooter genre, and its free trial events always draw a huge influx of players. However, because COD 21 servers are located overseas, players often encounter various issues like login failures, launch problems, and general inability to connect. To help players participate smoothly in the free weekend, this article details several practical solutions.

Method 1: Optimize Your Network Connection

Since COD 21 servers are located abroad, domestic players often experience network latency and instability, preventing them from accessing the game.  To resolve this, we recommend using Lagofast gamebooster.

1. Open the Lagofast gamebooster client, click "Redeem Code", and enter "Lagofast好用" to receive free acceleration time.

2. Search for "Call of Duty 21" within the Lagofast client and click to enter the acceleration interface.

3. Click the "Accelerate" button. After acceleration is complete, restart COD 21.

Method 2: Disable Firewall or Add to Whitelist

Firewalls can sometimes block connections to COD 21 servers, resulting in login failures. To resolve this, disable the firewall or add the game to its whitelist.

1. Locate your system's firewall settings and disable the firewall.

2. Alternatively, in the firewall settings, find the COD 21 executable file and add it to the whitelist.

Method 3: Update Graphics Drivers

Outdated graphics drivers can cause compatibility issues with COD 21, leading to launch failures or various in-game problems. Regularly check for and update your graphics drivers.

1. Visit the official website of your graphics card manufacturer (e.g., NVIDIA or AMD).

2. Download and install the latest drivers for your graphics card.

3. Restart your computer and try launching the game again.

Method 4: Close Unnecessary Background Programs

Excessive background programs consume system resources, potentially leading to insufficient memory for COD 21 and causing login errors. Close unnecessary background programs before launching the game.

1. Open the Task Manager and check which programs are consuming high CPU, memory, or network resources.

2. Close unnecessary background programs individually to free up system resources.

These are some effective solutions for addressing login and launch issues during the Call of Duty 21 free weekend.

Lagofast gamebooster is a well-established accelerator specializing in acceleration services. It supports all COD 21 servers, providing stable and smooth acceleration. It effectively resolves issues such as slow game downloads, high latency, game lag, disconnections, and online difficulties, ensuring a smooth online experience.

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