How to debug "HTTP request sent, awaiting response"?

I have a Linux server on an ADSL connection, and I just noticed that sometimes I get Connecting to example.com|xxx.xxx.xxx.122|:80... connected. HTTP request sent, awaiting response... when I use wget or e.g. a browser like firefox. In the case of wget pressing CTRL-C and then try again "solves the problem", and in the case of firefox, reloading the page also makes the page load. It seams to be random when it happens. I have tried to change the DNS to Google's DNS, but I still get the same problems there. Question How do I debug something like that, so I can find the source of the problem or perhaps a pattern?
Answer:

Have you ever tried waiting to see what HTTP status code returns? To debug this case, open 2 terminals: in the first, ssh to your server and type: # tcpdump -vv -s0 tcp port 80 -w /tmp/example.pcap (you can also append and src host <client_IP> to filter junk requests) and in the second, use wget to browse your website, reproduce this problem and switch to the first terminal and press Ctrl+C. Copy this .pcap file to the client and open with Wireshark to see what happens.

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Other answers

If you see: HTTP request sent, awaiting response... This means that the DNS works fine, that the TCP connection is in established state and the request was send. I think that the cause of your problems is the remote server that might be busy. As @quanta said a network capture will give you better details. In Wireshark just use Follow TCP Stream to see the HTTP conversation. Pay attention to ICMP messages too.

Mircea Vutcovici

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