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How to check why a website is not able to have connection...Please help

asked 2022-01-10 06:44:23 +0000

hapleen gravatar image

Suppose there is a website named ABC.com that is not able to have a connection so what should I check in the packet capture file in order to understand the reason.

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answered 2022-01-11 08:44:23 +0000

grahamb gravatar image

Within the browser, the sitename ABC.com is resolved to an IP address(es) via DNS lookups and then connection attempts will be made to the resolved IP.

In the capture, if the connection is using TCP, you should see TCP packets with the SYN flag being set to the resolved IP addresses, usually on port 80 (HTTP) or port 443 (HTTPS). Some browsers now use QUIC which are UDP packets, usually to port 443.

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Asked: 2022-01-10 06:44:23 +0000

Seen: 387 times

Last updated: Jan 11 '22