Hi last whole week I spent finding out the problem with my cellular network 's technical team. They have done some testing on their end. They told me that HTTP/non-HTTP ports are allowed at their end. Today they conclude that it needs to check on your end if the MongoDB server has some source-based restriction against mine cellular network Source IPs i.e. 119.160.0.0/16. so please check it, it will be helpful for me.