Steam error code 105 typically points to a network connection failure. This is often caused by DNS resolution errors, server response delays, or an unstable local network environment.  Here are eight solutions to help you resolve this issue:

Method 1: Optimize Your Network with LagoFast Game Booster

LagoFast game booster utilizes globally distributed nodes and intelligent routing optimization technology to effectively resolve error 105 caused by cross-regional access to Steam servers. After launching the software, select the "Steam Store/Community Acceleration" mode. The system will automatically allocate a low-latency node and repair any TCP/UDP transmission link anomalies. Tests show this can reduce connection interruption probability by over 85%. It's recommended to restart your Steam client after enabling acceleration to verify its effectiveness.

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Method 2: Clear Steam Download Cache

Corrupted local cache files in Steam can trigger security mechanisms that lead to error 105. To fix this, go to Steam client settings, navigate to the Downloads tab, and click the "Clear Download Cache" button. This action forces an update of CDN node information and rebuilds the transmission index. You'll need to re-login to your account afterward, and the system will automatically synchronize the latest server list. This method is particularly helpful for users who haven't cleared their cache for a long time.

Method 3: Change DNS Server Address

Changing your local DNS to 8.8.8.8 (Google DNS) or 1.1.1.1 (Cloudflare DNS) can bypass DNS resolution limitations imposed by your ISP's default DNS. In Windows network adapter properties, double-click the IPv4 protocol, uncheck "Obtain DNS server address automatically," and manually enter the preferred and alternate DNS addresses. Save the changes and then execute the command `ipconfig /flushdns` in the command prompt to clear the system DNS cache. This can resolve over 30% of DNS resolution failures.

Method 4: Check Firewall/Security Software Interference

Some antivirus software with deep packet inspection can mistakenly flag Steam processes. Ensure that both steam.exe and steamwebhelper.exe are whitelisted in Windows Defender Firewall's advanced settings. For third-party security software, temporarily disable "HTTPS scanning" and "Gaming Mode." Enterprise users should check if their router has Application Layer Gateway (ALG) filtering rules enabled.

Method 5: Reset Network Protocol Stack

Run CMD as administrator and enter the commands `netsh winsock reset catalog` and `netsh int ip reset reset.log`. Restart your computer to rebuild the network stack. This can fix underlying connection problems caused by incorrect TCP/IP configuration or a corrupted Winsock catalog, especially if you've modified MTU values or used VPN configurations in the past.

Method 6: Verify Integrity of Steam Game Files

Run the Steam repair tool by executing `steam.exe -verify` in the Steam installation directory.  The system will automatically detect and replace corrupted core components like Bin and Public files. If mismatched versions of steamclient.dll or steamservice.dll are detected, the program will retrieve the latest 2025 signature files from the content delivery network. This process requires a stable internet connection and takes approximately 5-10 minutes.

Method 7: Update Network Drivers

Users with Intel or Killer network cards should visit the manufacturer's website to download the 2025 certified drivers. During installation, enable "Advanced Stream Management" and "Low Latency Transmission." Realtek users are advised to disable power-saving mode and set "Interrupt Moderation Rate" to "Off" in the advanced properties. This setting can increase packet processing priority by 20%-40%.

Method 8: Contact Your ISP or Steam Support

If none of the above methods work, use the `tracert` command to diagnose routing hops. Submit the log containing timeout nodes to your internet service provider and request BGP route optimization.  Simultaneously, submit a ticket to Steam support including your client logs (located in the steam/logs directory) and network diagnostic report (accessible through Steam → Help → System Information). Steam engineers will check for any anomalies in your account's server binding status.