Source note · Web proxies and TLS inspection that break UC clients
Microsoft does not support selective allow-listing of only the Microsoft 365 endpoints thought to serve particular scenarios, and says to apply its guidance to the full set of published required endpoints.
Checked 2026-10-14
Microsoft does not support selective allow-listing as it causes connectivity and service incidents for users.
- Vendor
- Microsoft
- Product
- Microsoft 365
- Subsystem
- network connectivity
- Deployment
- multi-tenant
- Region
- not restricted
- Release range
- current as of 2026-10-14
- Checked
- 2026-10-14
Sources
- Microsoft 365 network connectivity principles — Microsoft · tier 2 current vendor documentation · Optimizing connectivity to Microsoft 365 services, opening paragraph
Cite this note
APA
WarmTransfer. (2026, October 14). Web proxies and TLS inspection that break UC clients: source note tls-inspection-uc-clients-m365-no-selective-allowlist. WarmTransfer. https://warmtransfer.net/knowledge/claims/tls-inspection-uc-clients-m365-no-selective-allowlist
BibTeX
@misc{warmtransfer-claim-tls-inspection-uc-clients-m365-no-selective-allowlist,
title = {Web proxies and TLS inspection that break UC clients: source note tls-inspection-uc-clients-m365-no-selective-allowlist},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/tls-inspection-uc-clients-m365-no-selective-allowlist},
note = {Source note tls-inspection-uc-clients-m365-no-selective-allowlist, checked 2026-10-14}
}