TcpTest.exe could be used to test tcp connections (syn/synAck/fin).
1 to 10 connections could be tested.
The return value is a number. 0 for testFail or 100 for testPass.

Syntax
tcptest.exe testsToBePassed n.n.n.n:p n.n.n.n:p

Example
tcptest.exe 1 192.168.10.220:80 192.168.10.35:8080

The first argument is used to set a minimum level for how many tests that
must be passed to return the value 100.

if synAck is received on both connections the return value = 100
if synAck is received on one connection the return value = 100
if no synAck is received the return value = 0


To run in debug mode you should create a file named tcpdebug.txt
in the same directory as tcptest.exe

NB!
In SNMPc you must use a Timeout Value of 25 secs for each device
in this test.

In the example above use Timeout=50 in SNMPc.
Always use Retries=0 in SNMPc.