topic Re: VPN: Security Warning: Untrusted Server in DevNet Sandbox

VPN: Security Warning: Untrusted Server

terence-hall — Tue, 25 Nov 2025 16:02:08 GMT

My reserved sandbox was created successfully but when I try to VPN using AnyConnect from the Windows store, I get a certificate error (Untrusted Server). I turned off Block Untrusted Servers in the AnyConnect settings and I'm still unable to connect. It shows that the OpenSSL certificate expired on Oct 11, 2025.

What is the work around for this?

Re: VPN: Security Warning: Untrusted Server

terence-hall — Tue, 25 Nov 2025 17:13:30 GMT

I'm no longer seeing Security Warning: Untrusted Server after rebooting. However, my VPN credentials aren't working. I'm getting login failed.

Re: VPN: Security Warning: Untrusted Server

Jesus Illescas — Tue, 25 Nov 2025 18:10:16 GMT

What sandbox is this @terence-hall ? and is your reservation still active? that might explain if the VPN credentials don't work. if the reservation is still active, can you share the environment id? you can find it on the url of the active lab you are using.

Re: VPN: Security Warning: Untrusted Server

terence-hall — Tue, 25 Nov 2025 19:38:29 GMT

Hi @Jesus Illescas,

It's the Catalyst 8/9k Single Instance Sandbox and it's still active.

Environment ID: JLd9dspkFvPf

Re: VPN: Security Warning: Untrusted Server

Jesus Illescas — Wed, 26 Nov 2025 18:18:23 GMT

@terence-hall I tested the sandbox and got the same error as you. I shared this with the sandbox team so they can take a look.

Re: VPN: Security Warning: Untrusted Server

terence-hall — Wed, 26 Nov 2025 18:28:58 GMT

Ok Thank you. Once resolved, can I extend the sandbox time period or will I need to register for a new one?

Re: VPN: Security Warning: Untrusted Server

Jesus Illescas — Wed, 26 Nov 2025 18:33:30 GMT

In some sandboxes the time can be extended while in other don't. I consider is best to grab a new reservation once the issue is solved. I will share here once I have news from the sandbox team

Re: VPN: Security Warning: Untrusted Server

jokearns1 — Wed, 26 Nov 2025 20:14:10 GMT

Hi @terence-hall ,

Looks like the cert has expired but you can still accept the self signed cert if you wish.
I will update that cert tomorrow.
Thanks for letting us know.
Joe

Re: VPN: Security Warning: Untrusted Server

terence-hall — Sat, 29 Nov 2025 01:44:46 GMT

My old reservation expired so I created another one. I'm having the same password issue. I really need to get this resolved.

Re: VPN: Security Warning: Untrusted Server

jokearns1 — Mon, 01 Dec 2025 08:37:31 GMT

Hi,
I see the password issue now. Its a problem connecting to our Security Cloud Control tenant,
I will spin up a lab for you this morning and get credentials sent directly. Do you need cat8k or cat9k image?
Thanks,

Joe

Re: VPN: Security Warning: Untrusted Server

terence-hall — Mon, 01 Dec 2025 16:55:56 GMT

Hi @jokearns1,

Cat9k image please.

Thank you.