Hello Tamilselvan Sivasankar,
Thank you for posting in Microsoft Community forum.
To enable Remote Assistance, you need to ensure that the following ports are open on the firewall:
- TCP port 135
- TCP port 3389
You may also need to enable the Remote Assistance exception in the Windows Firewall. To do this, follow these steps:
- Open Control Panel and click on System and Security.
- Click on Windows Firewall.
- Click on Allow an app or feature through Windows Firewall.
- Click on Change settings and then scroll down to Remote Assistance.
- Make sure that both Private and Public are checked and then click OK.
I hope the information above is helpful.
If you have any question or concern, please feel free to let us know.
Best Regards,
Haijian Shan