Source note · Web proxies and TLS inspection that break UC clients
The Webex App does not send the SNI extension on TLS-based media connections, so a proxy that requires SNI will cause connection failures to Webex audio and video services.
Checked 2026-10-14
Connection failure to the Webex audio and video services will occur if a proxy server requires the presence of SNI.
- Vendor
- Cisco
- Product
- Webex App
- Subsystem
- media
- Deployment
- multi-tenant
- Region
- not restricted
- Release range
- current as of 2026-10-14
- Checked
- 2026-10-14
Sources
- Network Requirements for Webex Services — Cisco Systems, Inc. (help.webex.com) · tier 2 current vendor documentation · Proxy Features > Proxy Inspection and Certificate Pinning (SNI sentence)
Cite this note
APA
WarmTransfer. (2026, October 14). Web proxies and TLS inspection that break UC clients: source note tls-inspection-uc-clients-webex-no-sni-tls-media. WarmTransfer. https://warmtransfer.net/knowledge/claims/tls-inspection-uc-clients-webex-no-sni-tls-media
BibTeX
@misc{warmtransfer-claim-tls-inspection-uc-clients-webex-no-sni-tls-media,
title = {Web proxies and TLS inspection that break UC clients: source note tls-inspection-uc-clients-webex-no-sni-tls-media},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/tls-inspection-uc-clients-webex-no-sni-tls-media},
note = {Source note tls-inspection-uc-clients-webex-no-sni-tls-media, checked 2026-10-14}
}