Binance app keeps reconnecting? MTU and TCP RST troubleshooting

If the price charts in your Binance app freeze every few minutes or the status bar constantly displays "Reconnecting," you are likely facing a classic network-layer issue. This guide covers how to troubleshoot these disconnections by looking at MTU, TCP RST, and NAT timeouts. To download the app, visit the Binance Official Site or get the Official Binance APP; for iPhone setup, see our iOS Installation Tutorial.

How persistent connections work

The Binance app retrieves real-time market data through a WebSocket persistent connection:

• A single TCP connection remains open.
• The server actively pushes price updates to the app.
• Heartbeat packets are sent every 20–30 seconds to keep the connection alive.
• If three heartbeats fail, the connection is dropped and a reconnection is triggered.

Any factor that interrupts this TCP persistent connection will cause the app to reconnect frequently.

Cause 1: Improper MTU settings

The Maximum Transmission Unit (MTU) determines the size of a single IP packet:

• Standard Ethernet MTU: 1500
• Some PPPoE dial-up connections: 1492
• Older ADSL connections: 1454
• VPN tunnels: Typically 1300–1400

If the MTU is set too high, packets may be fragmented or dropped by intermediate devices. Symptoms include:

• Large data packets (like full K-line updates) are lost.
• Heartbeat packets (small packets) work fine.
• The connection feels intermittent.

Troubleshooting:

• Run ping binance.com -f -l 1472 (Windows) to test for fragmentation.
• Find the largest value that doesn't fragment; that is your ideal MTU.
• Lower your router's MTU setting to resolve the issue.

Cause 2: Active TCP RST resets

Certain intermediate network devices may actively send a Reset (RST) packet to terminate what they deem a "suspicious" connection:

• Corporate firewalls blocking non-work traffic.
• ISP equipment resetting connections identified as "encrypted trading."
• Specific router rules being triggered.

Diagnosis: Check for TCP RST packets using a packet sniffer (like Wireshark). While this is difficult for average users, the symptoms are:

• The connection drops instantly (no gradual slowdown).
• Reconnection succeeds immediately.
• Drops may occur at fixed intervals (e.g., every 60 seconds).

Fixes:

• Switch networks (4G/5G or a different Wi-Fi).
• Disable proxies.
• Update or change your router firmware.

Cause 3: NAT timeouts

Home router NAT tables maintain a mapping for every connection:

• If a connection remains silent for too long, the NAT mapping times out.
• When the server subsequently sends a packet, the router can't find the mapping and drops it.
• The client receives no data and eventually times out and reconnects.

Binance's heartbeat frequency (30 seconds) is usually enough to prevent NAT timeouts. However, some ISP routers have extremely low timeout thresholds (e.g., 60 seconds), which can still trigger disconnections.

Fixes:

• Enable "Keep Heartbeat" within the app (if available).
• Upgrade your router firmware.
• Use a more stable wired connection.

Cause 4: Weak Wi-Fi signal

When a Wi-Fi signal is weak:

• Packet loss rate is high.
• TCP retransmissions become frequent.
• The connection eventually gets reset.

Diagnosis: Check the Wi-Fi signal bars on your phone. Anything less than two bars is likely a problem.

Fixes:

• Move closer to the router.
• Switch to the 5GHz band (if supported).
• Use an Ethernet cable.

Cause 5: ISP throttling

Some ISPs may limit or interfere with traffic related to encrypted trading:

• Symptoms: Everything is smooth at night but slow during the day.
• Or disconnections happen during specific time windows.

Fixes:

• Switch ISPs.
• Use a compliant network optimization solution.

Comprehensive troubleshooting flow

Ordered by time efficiency:

1. Switch to 4G/5G data to see if disconnections persist. If they do, the issue is not with your home network.
2. If disconnections stop on mobile data, try adjusting your MTU or restarting your router.
3. In a multi-user household, check if others are experiencing similar network issues.
4. If disconnections continue, test with a different ISP.

Disconnection frequency by scenario

Scenario	Average Disconnection Interval
Stable home broadband	No disconnections
Strong 4G/5G signal	No disconnections
4G while moving	30 seconds – 5 minutes
Public Wi-Fi	5 – 30 seconds
Filtered corporate network	30 – 60 seconds

How the app handles reconnection

When the Binance app detects a lost connection:

1. The status bar displays "Connection lost."
2. It waits 5 seconds before attempting to reconnect.
3. If reconnection succeeds, market data resumes.
4. If it fails, it waits 10 seconds before trying again.
5. After multiple failures, Error 1001 is triggered.

The entire reconnection process should be "nearly seamless." If it is noticeable to you, the disconnections are occurring too frequently.

Relationship with Error 1001

Frequent disconnections can eventually escalate to Error 1001:

• Short-term drops → Automatic reconnection.
• Persistent inability to connect → Error 1001.

For more details, see our article on Error 1001.

Habits to reduce disconnections

• Prioritize using Ethernet or 5GHz Wi-Fi.
• Avoid monitoring charts in subways or elevators with weak signals.
• Disable "Power Saving Mode" on your router.
• Avoid using too many proxy/VPN layers simultaneously.
• Keep your router firmware up to date.

Monitoring connection quality

You can use third-party tools for long-term monitoring:

• PingTools (Android)
• iNetTools (iOS)
• WinMTR (Windows)

Running these for a period will reveal whether your network is truly stable.

FAQ

Q: Will a disconnection cause my order to fail? A: No. Placing orders uses HTTPS short connections, which are independent of the WebSocket.

Q: Will I lose my account due to a disconnection? A: No.

Q: Can I stop the app from reconnecting? A: No. Reconnection is a necessary built-in mechanism.

Q: Is the web version more stable than the app? A: It depends on the browser implementation. Chrome is typically very stable.

Further Reading

• Fixing Error 1001
• Router Blocking Binance
• Switching DNS