Error while sending Rest request from stoplight GUI

Hi,

I have developed the APi documentation from my REST APi and when I try entering the hostname, login details and port using the stoplight GUI and Press “Send” button. This is the error I am getting.

Error sending request Get https://10.46.3.12:9440/abc/services/rest/v2.0/cluster: dial tcp 10.46.3.12:9440: i/o timeout

Can you please explain me reason its showing this error?

Thanks,
Smita.