I’m hoping someone here has experienced this or found a workaround.
I recently installed an ARRIS Surfboard G18 (DOCSIS 3.1, Wi-Fi 6) on Astound / RCN, and I’m running into a serious issue where HTTPS / encrypted traffic is being blocked or flagged as “not secure.”
Symptoms:
- Multiple devices (iPhone, computer) show “connection is not private” or certificate/privacy warnings
- Secure sites (HTTPS) intermittently fail or won’t load
- This happens across different browsers and devices, so it doesn’t appear to be device-specific
Important details:
- The G18 firmware forces app-only management via SURFboard Central
- The web UI (192.168.0.1) is locked and inaccessible
- The app does not expose system time / NTP, SSL inspection, or advanced firewall controls
- ISP (Astound/RCN) attempted reprovisioning and troubleshooting but could not resolve the issue
From what I can tell, this may be related to:
- An incorrect system clock / NTP sync
- Hidden HTTPS or TLS inspection in the G18 firmware
- App-managed firmware limitations
Has anyone else with a G18 experienced:
- HTTPS certificate errors
- “Not secure” warnings on otherwise normal websites
- Encrypted traffic issues that went away after a firmware change, bridge mode, or hardware replacement?
I’m trying to determine whether this is a known firmware defect, an ISP-specific issue, or something ARRIS is aware of. Any confirmation, workarounds, or official guidance would be greatly appreciated.