I have a few questions:
1. Are all machines on the same network?
2. Does the issue occur with all extracts?
3. Does the issue occur for all users?
4. Does web edit work properly with the published data source?
Thanks for the message at least you asked but i got a solution for this, it was due to some of security enabled software in some of the system's because of which the socket connection was not established and hence we were not able to get the data. May be i may ask you question some other time if got stucked in different scenario.
I'm a little concerned about your server's hardware specs. It's probably fine if you're doing testing or Proof of Concept for now. For production instance, make sure you meet Tableau's Minimum Hardware Recommendation:
Minimum Hardware Recommendations
For production use, the computer on which you install or upgrade Tableau Server should meet or exceed the minimum hardware recommendations. These recommendations are general. Actual system needs for Tableau Server installations can vary based on many factors including number of users, and number and size of extracts.
Free Disk Space
8-core, 2.0 GHz or higher
Multi-node and Enterprise deployments
Contact Tableau for technical guidance.
Nodes must meet or exceed the minimum hardware recommendations, except nodes running backgrounder, where 4 cores may be acceptable.