your HTTP request connection start duration too long

If your HTTP request connection start duration is taking more than 7 seconds, here are some possible causes and troubleshooting steps:

Possible Causes:

1. Network Latency – Slow internet or network congestion.
2. DNS Resolution Delay – Slow DNS lookup affecting the connection initiation.
3. Proxy or VPN Issues – Additional routing causing delays.
4. Server Response Delay – The destination server is slow to respond.
5. TCP Handshake Delay – Slow three-way handshake due to network or server issues.
6. TLS/SSL Handshake Delay – Issues with SSL negotiation.
7. High System Load – If the client machine is overloaded, connections may take longer.
8. Firewall or Security Software – Could be inspecting or delaying the request.

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Troubleshooting Steps:

1. Check Network Latency

Run the following command to check latency to the target server:

ping

If response times are high, network congestion or routing issues could be the cause.

2. Perform a Traceroute

To check where the delay occurs:

traceroute # Linux/macOS tracert # Windows

This helps identify if the issue is at the client, ISP, or server level.

3. Measure DNS Resolution Time

Test DNS lookup speed:

nslookup

or

dig

If it's slow, try using a faster DNS provider like Google (8.8.8.8) or Cloudflare (1.1.1.1).

4. Test Connection Time with curl

Check how long each phase of the request takes:

curl -o /dev/null -s -w "DNS Lookup: %{time_namelookup}\nTCP Handshake: %{time_connect}\nSSL Handshake: %{time_appconnect}\nTransfer Start: %{time_starttransfer}\nTotal Time: %{time_total}\n" https://your-url.com

This will help you pinpoint whether the delay is in DNS, TCP, SSL, or response time.

5. Check for Proxy or VPN Issues

• If using a proxy or VPN, disable it and test again.
• If behind a corporate proxy, check its logs for delays.

6. Optimize TLS/SSL Handshake

• If using HTTPS, check SSL negotiation time with:

  openssl s_client -connect :443 -debug

• Ensure the server supports modern ciphers and TLS 1.2+ for faster handshakes.

7. Increase Connection Pooling (for Java, Spring, etc.)

If you're using a Java application, enable HTTP connection pooling to reduce repeated handshakes:

PoolingHttpClientConnectionManager cm = new PoolingHttpClientConnectionManager(); cm.setMaxTotal(100); // Set max connections CloseableHttpClient httpClient = HttpClients.custom().setConnectionManager(cm).build();

8. Debug with Wireshark or TCPDump

Capture packets to analyze network delays:

tcpdump -i eth0 host

Or use Wireshark to inspect TCP handshake and SSL negotiation.

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Next Steps:

• If the issue is with the server, optimize server response times.
• If network-related, switch networks (e.g., mobile hotspot) and test again.
• If using a cloud service (e.g., AWS, Azure), check their status pages for outages.