Hikvision CCTV Live Stream fails (Sophos bug)

Issue

Hikvision DS-7604NI-E1 DVR live stram fails with error:

Note: Live view failed

Note: Live view failed.

The issue only affects the live view. Recorded videos and other web interface components are working fine.

Hikvision DS-7604NI-E1 is one of those older CCTV DVRs that only work in Internet Explorer as it requires an Active-X type plugin (WebVideoActiveX Control installed via WebComponents.exe)
WebVideoActiveX Control

Resolution

After a bit of experimenting, I narrowed down the issue to Sophos Endpoint Advanced antivirus product. After a few back and forths with Sophos technical support, they confirmed that this was a bug which will be fixed in 2022.1 update. I also noticed that the issue didn't affect older builds of Windows 10 (i.e. 20H2)

Although Sophos didn't provide an official workaround, I found that disabling the "Network Threat Protection" module allows to temporarily view the live stream.

Disable Sophos Network Threat Protection

May 2022
Windows 10 Pro (21H2)
Sophos Endpoint Advanced 10.8.11.4
Sophos Intercept X 2.0.24
Hikvision DS-7604NI-E1 DVR

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