When Telegram fails to connect, many users try configuring the MTProto proxy. However, even with seemingly correct configurations, Telegram may still fail to connect. This article will help you analyze the potential reasons in detail and provide specific troubleshooting suggestions.
This is a common issue many users face when first configuring a proxy. Below are possible reasons and solutions:
1. VPN is already connected locally:
- Explanation: VPN may intercept the system’s network route, causing Telegram to bypass the MTProto proxy and use the VPN tunnel instead.
- Solution: Disable the VPN or ensure that the VPN is not blocking Telegram.
2. Incorrect Secret Key:
- Explanation: The secret key may be invalid (wrong length, incorrect prefix, or incorrect base16/base64 encoding), or the key configured on the server may not match the key configured in your client.
- Solution: Check that the key is 32 bytes long (in hexadecimal) or has the correct prefix (ee/dd).
3. Proxy server address or port error: IP or domain misspellings, or the port being blocked by a firewall (common ports like 443, 8443). Check the spelling and ensure the port is open.
4. ISP or national firewall blocking the IP or port: Some MTProto proxy IPs may be blacklisted (e.g., GFW). Try using a different proxy or choose one with domain name obfuscation.
5. MTProto proxy server is down or unavailable: Even with correct configuration, the server may be offline or overloaded, making the connection impossible. Switch to a different proxy or contact the service provider to verify its status.
6. Outdated Telegram client version: Older versions of Telegram may not support certain types of encrypted proxies. Update to the latest version of Telegram.
7. Incorrect system time on the client: Telegram and the proxy use a timestamp for encryption handshakes. If the system time is too far off, it could cause failure. Synchronize the system time and ensure "automatic time" is enabled.
8. Incorrect proxy type: Users may mistakenly configure a SOCKS5 proxy instead of an MTProto proxy, or vice versa. Ensure that the proxy type matches Telegram’s supported format (MTProto exclusive).
9. The network environment uses proxy hijacking or DPI (Deep Packet Inspection): Some public Wi-Fi or carrier networks actively interfere with or analyze encrypted traffic, causing connection failures. Try switching to a different network, such as 4G or a different Wi-Fi, or use domain fronting (TLS camouflage) proxies.
10. Telegram is more widely blocked: Some countries or regions may not only block Telegram servers but also interfere with any related connections. Consider using a VPN + MTProto combination or use Shadowsocks + Telegram.
1. Check the proxy address, port, and secret key for accuracy.
2. Try using a different network (such as a mobile hotspot).
3. Update the Telegram client.
4. Test multiple proxy addresses (consider switching providers).
5. Sync the system time on your phone or computer.
6. Ensure no VPN or other proxies are interfering.
7. If it still doesn't work, try using a VPN tool to test if you can connect to the official Telegram website.
The failure to connect can stem from various factors, not just proxy configuration issues. By systematically troubleshooting VPN, secret keys, server status, system time, and client versions, users can usually pinpoint the problem. If you are still unable to resolve the issue, consider switching networks or using a combination of tools (such as VPN + MTProto) for better results.