Splunk Enterprise Security: After upgrading from Splunk 6.3.3 to 6.5.0, why are these threat lists failing to download?

After moving to Splunk 6.5 from Splunk 6.3.3, the following threat intelligence sources fail to download. **Splunk ES was upgraded to 4.5** I checked the server has internet access. I also excluded corresponding URLs from the proxy. msg="A threat intelligence download has failed" stanza="hailataxii_malware" status="Retrieved document from TAXII feed msg="A threat intelligence download has failed" stanza="mozilla_public_suffix_list" status="threat list download failed after multiple retries