1. Check your network connection and router settings to make sure they are allowing communication with the internet.

2. Check your firewall settings to see if there are any restrictions that would prevent your Exchange server from connecting to the internet.

3. Make sure you have the necessary hardware configured for your Exchange server to function properly.

4. Update your operating system, Exchange server, and other software if necessary.

5. Check to see if your exchange server is properly registered with your domain.

6. Test whether you are able to access the internet from the server.

7. Try restarting the server to verify that the problem has not been resolved.