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How to Identify Requests to prod.cosmic.office.net in Active Directory DNS

Maira Mehtab Sep 22, 2026 869 views

Question details

The user needs to identify the purpose of frequent DNS requests to domains under prod.cosmic.office.net originating from an on-premises Active Directory DNS server.

Product: Microsoft 365
Device & OS: not provided
Scenario: Monitoring network traffic and DNS server logs in an on-premises Active Directory environment.
Observed behavior: The on-premises Active Directory DNS server is receiving an unexpectedly high volume of queries for domains under prod.cosmic.office.net.

Before you start

Before posting to community support forums, gather your recent DNS logs, note any affected network services, and prepare your basic Microsoft 365 tenant details.

Solution 1Recommended

Consult Microsoft 365 Networking Experts via Microsoft Q&A

Since prod.cosmic.office.net involves internal Microsoft 365 routing, the best approach is to escalate your DNS logs to specialized networking experts for analysis.

Microsoft 365 utilizes a vast and dynamic network of endpoint domains for telemetry, syncing, and content delivery. Because these can vary by tenant, verifying specific cosmic.office.net endpoints requires specialized knowledge.

Gather Necessary Logs

Export your recent DNS debug logs from your on-premises Active Directory server, specifically filtering for the prod.cosmic.office.net queries.

Note Affected Services

Document any specific services, applications, or user connectivity issues that coincide with the timing of these frequent DNS requests.

Post to Microsoft Q&A

Navigate to the Microsoft Q&A portal online, select the Microsoft 365 category, and submit your question along with the collected tenant details and sanitized logs.

Protect Sensitive Data: Ensure you remove or mask any sensitive IP addresses or proprietary network information from your DNS logs before posting them publicly on the forum.

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Frequently Asked Questions

Is prod.cosmic.office.net a legitimate Microsoft domain?

Yes, it is typically associated with Microsoft's internal routing, telemetry, or Office network services, though exact endpoint purposes can vary based on your specific Microsoft 365 tenant configuration.

Should I block requests to prod.cosmic.office.net in my firewall?

It is generally not recommended to blindly block Microsoft 365 domains, as doing so might disrupt Office application connectivity, updates, or cloud sync services. Consult with Microsoft experts to verify before blocking.

How do I filter Active Directory DNS logs for specific Microsoft 365 queries?

You can use the Active Directory DNS Manager's debug logging feature or run PowerShell scripts to filter event logs specifically for queries containing 'office.net' to isolate the relevant traffic.

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