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You should take a closer look at your server security configuration, I assume the protocol used in this case does not enforce server access settings: https://www.ibm.com/support/knowledgecenter/en/SSKTMJ_9.0.1/admin/conf_modifyingwebserverinternetportandprotocolsettings_t.html
Is it possible for you to remove the /ORG from Access Server ? Maybe instead of whitelisting you should do blacklisting instead ?