HP ProCurve 6120G/XG Configuration Manual page 226

Time Protocols
SNTP: Viewing, Selecting, and Configuring
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SNTP Server Authentication Support
Note
SNTP server is not supported on ProCurve products.
The following must be performed on the SNTP server:
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If any of the parameters on the server are changed, the parameters have to be
changed on all the SNTP clients in the network as well. The authentication
check will fail on the clients otherwise, and the SNTP packets will be dropped.
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Among the keys that have been configured, one key or a set of keys
must be configured as trusted. Only trusted keys will be used for SNTP
authentication.
If the SNTP server requires authentication, one of the trusted keys
has to be associated with the SNTP server.
SNTP client authentication must be enabled on the ProCurve switch.
If client authentication is disabled, packets are processed without
authentication. All of the above steps are necessary to enable authen­
tication on the client.
The same authentication key-identifier, trusted key, authentication
mode and key-value that were configured on the SNTP client must
also be configured on the SNTP server.
SNTP server authentication must be enabled on the server.