Source note · Troubleshooting Expressway Mobile and Remote Access
From Expressway X8.8 forward and reverse DNS records are required for Expressway-C; Expressway-E and Unified CM nodes; missing PTRs show as reverseDNSLookup exceptions or 'Certificate verification failed ... Invalid Hostname'.
Checked 2026-10-01
- Vendor
- Cisco
- Product
- Cisco Expressway
- Subsystem
- dns
- Deployment
- on-premises
- Region
- not restricted
- Release range
- X8.8 and later
- Checked
- 2026-10-01
Sources
- Resolve Collaboration Edge Most Common Issues — Cisco Systems · tier 2 current vendor documentation · Log In Issues > Expressway reverse DNS lookup fails
Cite this note
APA
WarmTransfer. (2026, October 1). Troubleshooting Expressway Mobile and Remote Access: source note expressway-mra-troubleshooting-reverse-dns-x88. WarmTransfer. https://warmtransfer.net/knowledge/claims/expressway-mra-troubleshooting-reverse-dns-x88
BibTeX
@misc{warmtransfer-claim-expressway-mra-troubleshooting-reverse-dns-x88,
title = {Troubleshooting Expressway Mobile and Remote Access: source note expressway-mra-troubleshooting-reverse-dns-x88},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/expressway-mra-troubleshooting-reverse-dns-x88},
note = {Source note expressway-mra-troubleshooting-reverse-dns-x88, checked 2026-10-01}
}