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I'm trying to activate a community edition license, but it seems that the license server cannot be accessed, no matter for MDK 5 or 6. How can I solve the problem,please?
There are several reasons that can cause this error:
No access to the Internet.
Restricted access to the Internet is typically policed by firewall rules, which must be investigated by your local administrator.
A DNS problem, failing the resolution of the name mdk-preview.keil.arm.com
The license server is down.
(Talking to our IT a moment ago, we are not aware of a current license server problem)
...corresponding Knowledgebase Article:
https://developer.arm.com/documentation/ka005983/latest