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arris surfboard G18 blocking HTTPS/ encrypted traffic

  • January 20, 2026
  • 1 reply
  • 18 views
K
The Many
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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.

1 reply

S
Wi-Fi Warriors
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When you access the modem’s GUI using its IP address, you might see a “Not Secure” warning in your browser. This is completely normal because the connection is local and does not use a public SSL certificate like websites do. Your modem’s interface is still safe to use since you are accessing it directly within your network.

 

Regarding the firmware, DOCSIS standards dictate that the service provider must distribute firmware updates to cable modem devices.  The end-user cannot simply install an update like most other network-enabled devices.


ARRIS develops the software update and makes it available to service providers.  The service providers qualify, test, and distribute the software update to devices on their network.  ARRIS has limited control or visibility on distribution by the service providers.

 

Once the app is set up correctly, the GUI login credentials are managed by the app itself. Please refer to the link below for instructions on accessing the web interface using the login details provided by the app.

https://arris.my.salesforce-sites.com/consumers/articles/knowledge/SURFboard-Central-Web-Manager-Access

SURFboard Community Moderator Team
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