topic Re: Receiving Untrusted Server Certificate in DevNet Sandbox

Receiving Untrusted Server Certificate

necati-yeni — Fri, 14 Aug 2026 11:29:53 GMT

regarding network addresses certificate is expired, what should i do, should i keep going ?

Re: Receiving Untrusted Server Certificate

pieterh — Fri, 14 Aug 2026 13:38:00 GMT

depends on how trustworthy you think that the source of this certificate is.

if it is an company internal certificate -> you should at least inform the managing department of this certificate
if you look tat the certificate in detail and everithing else is as expected, you may continue

if it is an external company's certificate -> you should first verify that this company still owns the site where this certificate is used
be aware if a company has gone bankrupt, the domain-name may not have been closed (yet)

if it is a physical device (like web-config page of a network printer, or a soho router)
you may need to update it's firmware (containing a new certificate) first,

Re: Receiving Untrusted Server Certificate

Jesus Illescas — Mon, 17 Aug 2026 18:58:36 GMT

@necati-yeni if this is a certificate expired to connect to a DevNet sandbox you reserved on https://devnetsandbox.cisco.com/DevNet/ then yes, you can trust is and continue.

Also please share in which sandbox you found the expired certificate, so I can ask the sandbox team to update it.