I am not sure, but I can help you with some pointers here.
Two parts to the main error:
NaProtocolException & 403CannotLoadURLFilter
This document covers meaning for first part 'NaProtocolExceptionn':
https://library.netapp.com/ecm/ecm_download_file/ECMLP2860175
NaProtocolException —This class encapsulates the exception that arises due to a "protocol" problem. This means that the server responded with something that is not identifiable.
403 CannotLoadURLFilter - This is indicating URL filtering module, so is there a 'proxy' settings on the browser ?
Try these steps: [SDK can use "ontapi" via http or https, depending upon what you select, bydefault it is 'https']
Run this command on both Cluster:
::> set adv
::*> security config show
::*> system services web show
Compare the output of the above commands on both cluster, are they same ?
Next, if they are same, then check:
1) Browser settings, are you using any 'proxy' settings? for test purpose disable it and try.
2) Clear the browser cache, and try again.
3) What's the hostname of the two Clusters? (The one failing has any special characters).
Thanks!