HTTP Receive failed: Connect to <host>:8000 failed: NIEHOST_UNKNOWN(-2)

Dear Tech Gurus,

Below Error snapshot from Gateway client.. It error of HTTP Receive failed: Connect to <host>:8000 failed: NIEHOST_UNKNOWN(-2). I searched SCN but there is not solution I could find.

Did anyone face similar issue or have an idea what needs to done to resolve this ?

Thanks in tons.

PG