Source note · Web proxies and TLS inspection that break UC clients
Microsoft states that it has not tested TLS termination or deep packet inspection of any Microsoft 365 domain by customer proxies or other network devices, and that these are known to cause connectivity issues.
Checked 2026-10-14
- 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 · Additional network considerations, bullet 1
Cite this note
APA
WarmTransfer. (2026, October 14). Web proxies and TLS inspection that break UC clients: source note tls-inspection-uc-clients-m365-tls-termination-untested. WarmTransfer. https://warmtransfer.net/knowledge/claims/tls-inspection-uc-clients-m365-tls-termination-untested
BibTeX
@misc{warmtransfer-claim-tls-inspection-uc-clients-m365-tls-termination-untested,
title = {Web proxies and TLS inspection that break UC clients: source note tls-inspection-uc-clients-m365-tls-termination-untested},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/tls-inspection-uc-clients-m365-tls-termination-untested},
note = {Source note tls-inspection-uc-clients-m365-tls-termination-untested, checked 2026-10-14}
}