What indicates high thresholds in TCP statistics, especially Failed Connection Attempts?

1545 pts.
Tags:
failed connection attempts
Network troubleshooting
Networking
TCP
TCP IP
TCP/IP
I am trying to learn about TCP statistics, especially Failed Connection Attempts. What value would indicate a high threshold? Also, what causes these errors to occur? Does this indicate an issue at the remote or local host? Or does it have to do with network bandwidth or lack of I/O, etc.? Thanks!

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A failed TCP connection can be caused by any number of things. Normally a firewall somewhere between the two machines or the remote machine has been disconnected.

If the application isn’t responding quickly that could be registered as a failed connection attempt. That slow response could be caused by database slowdown, disk slowdown, CPU load, etc.

Just looking at the Failed Connection Attempts won’t give you a lot of troubleshooting information.
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Connection failed means the client attempted a TCP handshake with another host and the 3-way handshake was either not completed (SYN – SYN/ACK – ACK) or a RST was sent indicating that the service was not listening on that port. This is a normal part of TCP operation and is likely not creating any performance issues.

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