Error 63 occurred at TCP Open Connection in Segger RTT TCP Client.vi

[EEJoe]

Hello,

I am interacting with the Segger RTT interface via TCP. Upon ESTABLISHING a connection, they spawn another LISTENER. I am able to indefinitely telnet to 127.0.0.1 19021 and create new connections:

0
C:\cmder
λ netstat -an -p tcp | findstr 19021
  TCP    127.0.0.1:19021        0.0.0.0:0              LISTENING

1
C:\cmder
λ netstat -an -p tcp | findstr 19021
  TCP    127.0.0.1:19021        0.0.0.0:0              LISTENING
  TCP    127.0.0.1:19021        127.0.0.1:60132        ESTABLISHED
  TCP    127.0.0.1:60132        127.0.0.1:19021        ESTABLISHED

2
C:\cmder
λ netstat -an -p tcp | findstr 19021
  TCP    127.0.0.1:19021        0.0.0.0:0              LISTENING
  TCP    127.0.0.1:19021        127.0.0.1:60132        ESTABLISHED
  TCP    127.0.0.1:19021        127.0.0.1:60155        ESTABLISHED
  TCP    127.0.0.1:60132        127.0.0.1:19021        ESTABLISHED
  TCP    127.0.0.1:60155        127.0.0.1:19021        ESTABLISHED

In the LabVIEW vi, TCP Open Connection only works in case `0` above, which is when no connections are ESTABLISHED. In cases 1 and 2, I get Error 63: 

Spoiler

Error 63 occurred at TCP Open Connection in RTT TCP Client.vi

Possible reason(s):

LabVIEW: Serial port receive buffer overflow.
=========================
LabVIEW: The network connection was refused by the server.

How can I get LabVIEW TCP Open Connection to behave more like telnet and find the LISTENER?

Cheers,

Joe

[EEJoe]

Further testing shows that there is a maximum of two connections no matter what application attempts to connect. LabVIEW only works for the first connection.

[EEJoe]

Upon "Close TCP Connection" in LabVIEW it results in these states (CLOSE_WAIT and FIN_WAIT_2):

C:\cmder
λ netstat -aon -p tcp | findstr 19021
TCP 127.0.0.1:19021 0.0.0.0:0 LISTENING 1656
TCP 127.0.0.1:19021 127.0.0.1:60938 CLOSE_WAIT 1656
TCP 127.0.0.1:19021 127.0.0.1:61013 ESTABLISHED 1656
TCP 127.0.0.1:60938 127.0.0.1:19021 FIN_WAIT_2 8148
TCP 127.0.0.1:61013 127.0.0.1:19021 ESTABLISHED 11860

Same occurs with Telnet. Not finishing closing the connection may be a Segger issue.