Hello kan2332,

can you check this on the Postman ? i think the Method URL is Not in the Working condition ,First check on the Postman if you get same error on the postman than it is problem of that URL

Hi kan2332,

The IP address falls in the private IP address range 192.168. 0.0 to 192.168. 255.255.

Private internal addresses are not routed on the Internet and no traffic cannot be sent to them from the Internet, they only supposed to work within the local network.
 

This is probably the reason why you get the  "The underlying network was closed" error message.

Regards,

Daniel