@Jamshid Dehghanian  - You are running a Community Edition of InterSystems IRIS for Health, and the built-in license key will only work for approximately one year and then will expire ... this may lead to the message you're seeing.  Options include:

- Go to Evaluation.InterSystems.com and download the latest version of InterSystems IRIS for Health Community Edition

- Reach out to your account manager and ask for an extended Community Edition key that you can install on your instance

Note - your routines and classes will be stored within the Routine DB for your Namespace, so you should be able to look in the SMP and see which iris.dat this is and you can just make a copy of that file on the OS level (stop InterSystems IRIS first).  This will ensure that you don't lose anything for that namespace.  You can also back up your data database if that is important to you.  When you upgrade to a newer kit these should be preserved anyway, but I understand you'd like extra insurance so this is the way to ensure that.

Hope that helps

"I have no idea, who at ISC wrote this recommendation " - this is the whole point ... this wasn't written by anyone at ISC, but is inferred / synthesized / arrived at by the ChatGPT algorithm.  I did several google searched on strings from the result I was given and couldn't find this anywhere.  So ChatGPT isn't copying content, it is generating it ... albeit incorrectly in this case :)

As we looked into things further on our side, it appears as though the UNIX 'hostname'.  We were able to resolve the issue in UNIX by doing the following to change the hostname to 'mynewhost':

log in as root
hostname mynewhost
echo mynewhost > /etc/hostname

The 2nd line will change the hostname in the current processes, and the 3rd will make sure that the change will persist during a reboot.  

Hope this is helpful to someone else.