Hello, I had success with this issue about 2 years ago when some TWC folks contacted me. I don’t know if those folks are still with TWC/Charter here in the end of 2017 - hence posting on NANOG. The tl;dr is IPv6 reverse DNS issues. It was broken, got fixed, and seems to have broken again recently.
Thanks in advance. -- Brandon Applegate - CCIE 10273 PGP Key fingerprint: 0641 D285 A36F 533A 73E5 2541 4920 533C C616 703A "For thousands of years men dreamed of pacts with demons. Only now are such things possible."
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