szymon_dybczak
Esteemed Contributor III

Unfortunately, I don't know if such a list exists. But you can try to use nslookup with vc option which forces nslookup to use TCP protocol instead of UDP to verify that udp protocol is blocked.

szymon_dybczak_1-1770044274630.png

Another reason why in your case you may be hitting this error is following limitations.

szymon_dybczak_0-1770043906882.png

Maybe my free edition is hosted in different region where this domain is not blocked.