Thingworx C SDK on Linux- socket connection. Err = 111

[Bhau]

I am using Thingworx C SDK on linux to communicate with thingworx internal server, but i am getting following error.

[FORCE] 2018-03-08 03:54:52,672: Starting up...
[WARN ] 2018-03-08 03:54:52,683: SDK Version: 2.0.2
[WARN ] 2018-03-08 03:54:52,683: TLS Library: OpenSSL
[WARN ] 2018-03-08 03:54:52,683: TLS Library Version: 1.0.2l
[DEBUG] 2018-03-08 03:54:52,683: twWs_Create: Initializing Websocket Client for zbdpyqlt.studio-trial.thingworx.io:8443//Thingworx/WS
[DEBUG] 2018-03-08 03:54:52,683: twTlsClient_Create: Initializing TLS Client
[DEBUG] 2018-03-08 03:54:53,111: twApi_Initialize: Websocket Established after 0 tries
[DEBUG] 2018-03-08 03:54:53,113: subscribedPropsMgr_Initialize: Initializing subscribed properties manager
[DEBUG] 2018-03-08 03:54:53,129: added SteamSensorThing to boundList
[DEBUG] 2018-03-08 03:54:53,130: twApi_BindThings: not currently connected, only binding things to api
[DEBUG] 2018-03-08 03:54:53,131: twMessage_Delete: Deleting BIND Message: 1
[TRACE] 2018-03-08 03:54:53,132: twApi_Connect: Delaying 1 milliseconds before connecting
[DEBUG] 2018-03-08 03:54:53,134: twTlsClient_Reconnect: Re-establishing SSL context
[DEBUG] 2018-03-08 03:54:53,136: twTlsClient_Connect: Connecting to server
[ERROR] 2018-03-08 03:54:53,136: Error intializing socket connection. Err = 111
[ERROR] 2018-03-08 03:54:53,137: twWs_Connect: Error restarting socket. Error 111
[DEBUG] 2018-03-08 03:54:58,137: twTlsClient_Reconnect: Re-establishing SSL context
[DEBUG] 2018-03-08 03:54:58,139: twTlsClient_Connect: Connecting to server
[ERROR] 2018-03-08 03:54:58,139: Error intializing socket connection. Err = 111
[ERROR] 2018-03-08 03:54:58,139: twWs_Connect: Error restarting socket. Error 111
[DEBUG] 2018-03-08 03:55:03,140: twTlsClient_Reconnect: Re-establishing SSL context
[DEBUG] 2018-03-08 03:55:03,141: twTlsClient_Connect: Connecting to server
[ERROR] 2018-03-08 03:55:03,142: Error intializing socket connection. Err = 111
[ERROR] 2018-03-08 03:55:03,142: twWs_Connect: Error restarting socket. Error 111
[ERROR] 2018-03-08 03:55:08,142: twApi_Connect: Max number of connect retries: 3, has been reached

The connection works well if i connect to the cloud server, but i want to connect to the internal server.

What could be the issue with the internal server?

Do i need to add any SSL certificate for the internal server or Do i need to change any configuration?

Regards,

Bhau

[CRArko]

Hi, Bhau.

This certainly looks like an SSL error. You can verify that by temporarily disabling SSL in the C-SDK.

This post describes how to accomplish that, and also very correctly warns about never doing this on a system intended for Production or otherwise exposed. If it does work after disabling SSL check the certificate chain to find anything missing (maybe intermediate certificates?) and re-enable SSL as soon as possible.

Thanks,

-- Craig A.

[Bhau]

Hi,

How do i add SSL certificates in C-SDK?

Regards,

Bhau

[alex.augot]

Hi @Bhau,

Error 111 is a 'Connection Refused' error on Linux, so the edge agent isn't able to connect because the platform is refusing the request.  Sounds like something may be misconfigured on your Tomcat instance.

[Bhau]

I tried to ping the server from the linux machine that am using as a client and got the following response.

PING zbdpyqlt.studio-trial.thingworx.io (34.203.75.210) 56(84) bytes of data.

^C

--- zbdpyqlt.studio-trial.thingworx.io ping statistics ---

82 packets transmitted, 0 received, 100% packet loss, time 81054ms

does this some kind of firewall issue? 

regards,

Bhau