Symptoms
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Plesk is unresponsive and may say the license is expired
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Plesk shows the following error
ERR [1] Token validation failed: Can not connect to 'ka.plesk.com' (6:6). Please check connection to 'ka.plesk.com' or contact Plesk support: <a href='https://www.plesk.com/support/' target='_blank'>https://www.plesk.com/support/</a>.; ; KV network error (ka.plesk.com: cURL cannot communicate with license server https://ka.plesk.com/jsonrest/pkp/20/verify-key (): Couldn't resolve host name(6)
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Retrieving the license on the command line fails with one of these messages
ERR [panel] KeyUpdate Result code: 2 Unspecified error
ERR [panel] KeyUpdate Result desc: License key is not prolongated yetERR (3): KeyUpdate Result code: 2 Network failure
ERR (3): KeyUpdate Result desc: Couldn't resolve host name -
ka.plesk.com
can't be resolved by some of the serves' DNS resolvers:# dig ka.plesk.com @203.0.112.2
...
;; connection timed out; no servers could be reached
Cause
DNS server misconfiguration.
Resolution
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Resolve the DNS server issue with the hosting provider, or change the system's DNS resolvers
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Connect to the server via SSH and reinstall license key manually
# plesk bin license --install A00000-A00000-A00000-A00000-A00000