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PFSense - Troubleshooting - Amazon app reports "Ooops, an error has occurred"

Most likely caused by a pfBlockerNG DNSBL entry to block AWS IPs.

Whitelist the following:

device-metrics-us.amazon.com
aax-us-iad.amazon.com
aan.amazon.com
ad.doubleclick.net
googleadservices.com
ssl.google-analytics.com
s0.2mdn.net

NOTE: pfBlockerNG's DNSBL does not support wildcard domains.

This means that you need to whitelist subdomains individually.