Source note · Web proxies and TLS inspection that break UC clients
Microsoft lists blocking specific protocols or protocol versions on intermediate network infrastructure, with QUIC and WebSockets as examples, as known to cause Microsoft 365 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 2
Cite this note
APA
WarmTransfer. (2026, October 14). Web proxies and TLS inspection that break UC clients: source note tls-inspection-uc-clients-m365-block-quic-websocket. WarmTransfer. https://warmtransfer.net/knowledge/claims/tls-inspection-uc-clients-m365-block-quic-websocket
BibTeX
@misc{warmtransfer-claim-tls-inspection-uc-clients-m365-block-quic-websocket,
title = {Web proxies and TLS inspection that break UC clients: source note tls-inspection-uc-clients-m365-block-quic-websocket},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/tls-inspection-uc-clients-m365-block-quic-websocket},
note = {Source note tls-inspection-uc-clients-m365-block-quic-websocket, checked 2026-10-14}
}