Solved
Below are couple of things I noticed,
You cannot use 8443 port with http, it has to be either https://localhost:8443/Thingworx/Composer or http://localhost:8080/Thingworx/Composer
In Kepware, Project > Properties > Thingworx you cannot set Disable Encryption to Yes when using SSL so update it to No.
Update the Resource value to /Thingworx/WS
The appKey is tied to KepwareUser make sure that user has all the proper permissions.
Try to connect again after making these changes.
Regards,
Sachin Sharma
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