subhi

Do you have the right ports open? Does exa intercept apple traffic? See https://support.apple.com/en-gb/HT210060 and you can test your network using JET https://github.com/jamf/Jamf-Environment-Test

Your question isn't clear and doesn't provide many details. You can manually add an iPad using ac2 to Automated Device Enrolment (ADE) aka the service formerly known as DEP. Once you do that, you need to login to ASM and point your iPad to your MDM. As for the timeout. Apple has changed its network requirements document in the last 4 weeks, see: https://support.apple.com/en-gb/HT210060 Make sure you have all the right hosts and ports open. If you need to test your network check out JET https://github.com/jamf/Jamf-Environment-Test