Ncat: Connection Refused

[Rolf Peters]

Hello anyone :-),

I am getting a Ncat: Connection refused after the command pdp1control start and I have no idea what it's cousing this message...

regards Rolf

[Oscar Vermeulen]

Rolf,

I remember seeing this on the Pi, although just now on my Linux laptop I don't. Will look in to it, but it is not interfering with normal use I think? 

Kind regards,

Oscar.

[Jeremy Radwan]

I see this every now and then but it doesn't seem to be hurting anything.

09:27:14 /opt/pidp1/install:$ pdp1control start
start panel driver, either virtual or real, depends on the symlink
starting PiDP-1 hardware front panel driver
read boot config from sense switches
switches set to 1
start pidp1 in screen
start gui peripherals
Configuring PiDP-1 for boot number 1
mul-div now on
Ncat: Connection refused.
ok
Ncat: Connection refused.
start usb paper tape tool

[Bill E]

It does not seem to be coming from the pidp, grepping all the C sources don't find it. I've never seen it.
Bill

[Jeremy Radwan]

Maybe from this?

[Bill E]

Looks like that's it. I didn't search the shell scripts. Still, don't know what the problem is.

Bill

[Jeremy Radwan]

In some quick testing, I only seem to see the ncat errors the first time I try to start pdp1control after the RasPi boots. After the first execution of pdp1control, there are things listening on ports 1040/1050 so future executions of pdp1control don't show the ncat errors.

13:46:39 ~:$ netstat -a |grep 1040
13:46:46 ~:$ netstat -a |grep 1050

13:46:53 ~:$ pdp1control start

start panel driver, either virtual or real, depends on the symlink
starting PiDP-1 hardware front panel driver
read boot config from sense switches
switches set to 1
start pidp1 in screen

start web server

Configuring PiDP-1 for boot number 1
mul-div now on
Ncat: Connection refused.
ok
Ncat: Connection refused.
start usb paper tape tool

13:46:58 ~:$ netstat -a |grep 1050
tcp6       0      0 [::]:1050               [::]:*                  LISTEN

13:47:00 ~:$ netstat -a |grep 1040
tcp        0      0 0.0.0.0:1040            0.0.0.0:*               LISTEN
tcp        0      0 localhost:59010         localhost:1040          TIME_WAIT
tcp        0      0 localhost:59036         localhost:1040          TIME_WAIT
tcp        0      0 localhost:59020         localhost:1040          TIME_WAIT
tcp        0      0 localhost:59024         localhost:1040          TIME_WAIT

13:47:02 ~:$ pdp1control stop
Stopping PiDP-1
Terminated

13:48:27 ~:$ pdp1control start

start panel driver, either virtual or real, depends on the symlink
starting PiDP-1 hardware front panel driver
read boot config from sense switches
switches set to 1
start pidp1 in screen

start web server

Configuring PiDP-1 for boot number 1
mul-div now on

ok
start usb paper tape tool <-- no ncat errors this time

13:48:32 ~:$ netstat -a |grep 1040
tcp        0      0 0.0.0.0:1040            0.0.0.0:*               LISTEN
tcp        0      0 localhost:53746         localhost:1040          TIME_WAIT
tcp        0      0 localhost:53760         localhost:1040          TIME_WAIT
tcp        0      0 localhost:53720         localhost:1040          TIME_WAIT
tcp        0      0 localhost:53732         localhost:1040          TIME_WAIT

13:48:35 ~:$ netstat -a |grep 1050
tcp6       0      0 [::]:1050               [::]:*                  LISTEN
tcp6       0      0 localhost:37506         localhost:1050          TIME_WAIT
tcp6       0      0 localhost:37516         localhost:1050          TIME_WAIT