Hey there Prashantch1,
I apologize for the late response, and thank you for being patient! Were you able to fix that connection issue? If not, I'd be happy to help out, as these networking problems can be tricky to solve on your own. The first thing I would do is make sure your Chromecast's firmware is up-to-date. Then, go ahead and follow these steps in order, noting any errors you run into.
I look forward to your response, and if you have any other questions or concerns for me, please let me know!