SOLVED: VIDEO: How to use WireShark to Troubleshoot RST TCP Resets – Up & Running Technologies, Tech How To's

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If you have a tool like Logic Monitor reporting that reporting something like:

The host SRV is experiencing an unusual number of failed TCP connections, probably incoming connections.
There are now 3.27 per second failed connections, putting the host in a warn level.
LogicMonitor

you can use free tools like WireShark to capture all of the network traffic on a Windows Server (or PC like Win 10 or Win 11 for that matter) then sort and filter the failures to look for patterns:

Here are some common TCP port numbers to consider:

Port Number	Usage
20	File Transfer Protocol (aka FTP) Data Transfer
21	File Transfer Protocol (aka FTP) Command Control
22	Secure Shell (aka SSH)
23	Telnet – Remote login service, unencrypted text messages
25	Simple Mail Transfer Protocol (aka SMTP) E-mail Routing
53	Domain Name System (aka DNS) service
80	Hypertext Transfer Protocol (aka HTTP) used in World Wide Web
110	Post Office Protocol (aka POP3) used by e-mail clients to retrieve e-mail from a server
119	Network News Transfer Protocol (aka NNTP)
123	Network Time Protocol (aka NTP)
143	Internet Message Access Protocol (aka IMAP) Management of Digital Mail
161	Simple Network Management Protocol (aka SNMP)
194	Internet Relay Chat (aka IRC)
443	HTTP Secure (aka HTTPS) HTTP over TLS/SSL

Categories: Windows 11 & Windows 10Windows Server

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