Hi kaushal parab,
Thank you for reaching out to us on the Microsoft Q&A forum.
As an original poster cannot accept their own answer, I am reposting it so that you can accept it an answer. Accepted answer will help other community members navigate to the appropriate solutions.
Issue: Application gateway stop and start ends up with an error.
Solution: It was due to NSG on subnet. when i removed the nsg on agw subnet then i can able to start the application gateway.
Remember to "Accept Answer" so that others in the community who are experiencing similar challenges can easily find a solution.
Your contribution is greatly appreciated.
Regards,
Rohith