IOS Self-Signed Certificate Expiration on Jan. 1, 2020

At 00:00 on 1 Jan 2020 UTC, all Self-Signed Certificates (SSC) that were generated on IOS/IOS-XE systems will expire, unless the system was running a fixed version of IOS/IOS-XE when the SSC was generated.  After that time, unfixed IOS systems will be unable to generate new SSCs.  Any service that relies on these self-signed certificates to establish or terminate a secure connection might not work after the certificate expires.

https://www.cisco.com/c/en/us/support/docs/security-vpn/public-key-infrastructure-pki/215118-ios-self-signed-certificate-expiration-o.html

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