Cisco Expressway Certificate Creation and Use Deployment Guide (X15.5) - Using ACME on Expressway-E

Publisher

Cisco Systems

URL

https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/expressway/config_guide/X15-5/cert-creation-use/exwy_b_cisco-expressway-certificate-creation-and-use-deployment-guide-x155/exwy_m_using-acme-on-expressway-e.html

Published

2026-07-29

Updated

unknown

Accessed

2026-09-30

HTTP status

200

License

Cisco documentation; all rights reserved; no-redistribution; short excerpts and locators only

Source notes citing this source

• When ACME is used, the Let's Encrypt intermediate CA certificate is appended to the trust store of each Expressway-E and of the traversal Expressway-C. in context
• The ACME service on Expressway-E signs and deploys server certificates automatically, and Let's Encrypt is the only CA it currently works with. in context
• A certificate deployed by ACME does not need an Expressway-E restart; the processes that use it load the new certificate on their own. in context
• In a cluster, ACME is enabled on each Expressway-E peer separately, and each peer's CSR carries only that node's FQDN and the cluster FQDN. in context
• ACME on Expressway-E needs inbound TCP 80 from the internet to every Expressway-E peer, because the requester must answer on port 80 for each domain in the CSR. in context
• The Expressway-E ACME service renews a certificate once two-thirds of its validity period has passed, and deployment can be scheduled for chosen times and weekdays. in context

Cite this source record

APA

WarmTransfer. (2026, July 29). Cisco Expressway Certificate Creation and Use Deployment Guide (X15.5) - Using ACME on Expressway-E. WarmTransfer. https://warmtransfer.net/knowledge/sources/cisco-exwy-x155-cert-acme

BibTeX

@misc{warmtransfer-cisco-exwy-x155-cert-acme,
  title  = {Cisco Expressway Certificate Creation and Use Deployment Guide (X15.5) - Using ACME on Expressway-E},
  author = {{WarmTransfer}},
  year   = {2026},
  url    = {https://warmtransfer.net/knowledge/sources/cisco-exwy-x155-cert-acme},
  note   = {Cisco Systems, accessed 2026-09-30}
}