DNS Server created CNAME loop loading CNAME at 17.00twx.120.210.202.in-addr.arpa.. One link in CNAME loop: DNS name 17.00twx.120.210.202.in-addr.arpa. is alias for CNAME 17.00twx.120.210.202.in-addr.arpa.. See adjoining messages for other links in CNAME loop.
As per Microsoft: "The two CNAME aliases listed in the error message contain references to each other, creating a CNAME loop. CNAMES allow you to use more than one name to identify a host". See MSW2KDB for additional information about this event.
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