Microsoft 365 network connectivity principles
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When optimizing connectivity to Microsoft 365, certain network configurations may have a negative impact on Microsoft 365 availability, interoperability, performance, and user experience. Microsoft has not tested the following network scenarios with our services, and they are known to cause connectivity issues.
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−- TLS termination or deep packet inspection of any M365 domains with customer proxies or other types of network devices or services.
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+- TLS termination or deep packet inspection of any Microsoft 365 domains with customer proxies or other types of network devices or services.
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- Blocking specific protocols or protocol versions such as QUIC, WebSocket’s, etc. by intermediate network infrastructure or service.
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- Forcing downgrade or failover of protocols (such as UDP --> TCP, TLS1.3 --> TLS1.2 --> TLS1.1) used between client applications and Microsoft 365 services.
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- Routing connections through network infrastructure applying its own authentication such as proxy authentication.
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We recommend that customers avoid using these network techniques to traffic destined to Microsoft 365 domains and bypass these for Microsoft 365 connections.
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−Microsoft recommends setting up an automated system to download and apply the M365 network endpoint list regularly. Refer to [Change management for Microsoft 365 IP addresses and URLs](managing-office-365-endpoints.md#change-management-for-microsoft-365-ip-addresses-and-urls) for more information.
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+Microsoft recommends setting up an automated system to download and apply the Microsoft 365 network endpoint list regularly. Refer to [Change management for Microsoft 365 IP addresses and URLs](managing-office-365-endpoints.md#change-management-for-microsoft-365-ip-addresses-and-urls) for more information.
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## Comparing network perimeter security with endpoint security
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<a name="BKMK_SecurityComparison"> </a>
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