Aaron - You will want to make sure that you have the following setup when setting up SNTP on NetVanta switch devices:
1. Enable SNTP
switch(config)# sntp-server <SNTP IP address/hostname>
2. Configure default-gateway. This is necessary for the NetVanta switches themselves to have connectivity to the internet so that they can receive SNTP updates.
switch(config)# ip default-gateway <default gateway IP>
3. Configure DNS servers on AOS device. This is necessary for an AOS device to resolve the hostname of the SNTP server you specified in step 1 (if you did).
switch(config)# ip name-server <DNS server IP>
Based on the description of your issue, you may want to verify that you have a default-gateway set on your NetVanta switches and that you are able to ping out to the internet from those devices. If this does not resolve your issue, please reply to this email with the configuration of your device. Please remember to remove any information that may be sensitive to your network.
Please do not hesitate to let us know if you have any questions.
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Have you tried Synching it with your internal SNTP server / domain controller? Should really sync the domain controller, then sync devices from it.
sntp server xx.xxx.xx.xx version 3 is what we use to sync internally to a 2008R2 DC
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