You might consider elaborating further - self-evidently a remote process has stopped responding when a connection (of some sort) cannot be established with it aka it's stopped responding.

For example, try identifying...

• The protocol &/or port over which you're attempting communication
• The OS at both ends of the connection
• Whether the (behaviour of the) remote process is modifiable (in any way)
• What you've tried thus far - in an attempt to reduce effort by eliminating repetition (of solutions you may have already tried)