My ATT gateway REALLY did not like the web version of DABL - I got a notification that the URL was blocked "We've blocked an unsecure URL and your device is secure" but when I selected Allow Access, the gateway continued to block the URL because now it was a known Spam URL.
I stopped the recording that was the DVR was trying to start and the notifications stopped.
2021/09/30 13:24:35.826906 [ERR] Error during stream TVE-YouTubeTV ch6781 DABL: Failed to download file: https://cbsta49f-cbsta49f-ms.global.ssl.fastly.net/dable4hd/master/dable4hd_5/02237/dable4hd_5_20210930T182352_5_00004.ts: Get "https://cbsta49f-cbsta49f-ms.global.ssl.fastly.net/dable4hd/master/dable4hd_5/02237/dable4hd_5_20210930T182352_5_00004.ts": read tcp 192.168.1.74:53012->199.232.33.194:443: wsarecv: An existing connection was forcibly closed by the remote host.