Citrix Cloud: Unable to create machine account in Active Directory through MCS
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Article ID: CTX458739
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Updated On:
Description
You may be unable to add machines from existing On-Premises Active Directory option that comes up when adding machines through MCS which is grayed out.
You may also see this Unknown Error:

Resolution
The traffic should be allowed for Kerberos UDP and TCP Port 88 from Source (Cloud Connector) to Destination(Domain Controller) on the firewall
Problem Cause
Cloud connector couldn't reach root domain: [ForestCrawler] Error encountered while attempting to crawl domains in forest
Additional Information
Reference:
https://docs.citrix.com/en-us/citrix-cloud-government/system-requirements/cloud-connector-requirements.html
https://docs.microsoft.com/en-US/troubleshoot/windows-server/networking/service-overview-and-network-port-requirements
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