【HCI/aCMP Product Warning】Failed to access HCI/aCMP Web UI with latest browser version
  

CTI TF Lv2Posted 20 Nov 2023 16:02

Last edited by CTI TF 20 Nov 2023 16:03.

Bug Phenomena
When accessing to HCI or aCMP Web UI with the latest browser version, it will show either "can't reach this page" or show blank page.


Trigger conditions
1. HCI or aCMP version below 6.1.0.
2. Using latest version of the web browser.
a. Microsoft Edge with version 119 and above.
b. Google Chrome with version 118 and above.
c. Mozilla Firefox with version 119 and above.


Root Cause

Old version of HCI does not support Encrypted ClientHello(ECH) protocol and lead to the inaccessible WebUI.


How to check
1. Verify the current version whether it is lower than HCI6.1.0.
2. Verified if the the browser version match with the version listed above.


Solution
1. Permanent solution : Advised to upgrade the HCI version to 6.1.0 and above.
2. Personal solution: Disable ECH protocol on Chrome/Firefox and use these 2 browsers due to Edge unable to disable the ECH protocol.
a. For Chrome
i. Open Chrome with new tab, and enter to the chrome://flags.
ii. Change the action to "Disabled" and relaunch the Chrome browser.

b. For Firefox
i. Launch the Firefox and enter to about:config.

ii. Search for ech and change the value of these 4 attributes.
- network.dns.echconfig.enabled > Change to false.
- network.dns.echconfig.enabled > Change to false.
- security.tls.ech.grease_http3 > Change to false.  
- security.tls.ech.grease_probability > Change to 0.

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Newbie517762 Lv5Posted 20 Nov 2023 17:00
  
Thanks for your valuable contribution.
SassyScorpio Lv2Posted 20 Nov 2023 21:59
  
Thanks for sharing.
ArsalanAli Lv3Posted 08 Dec 2023 13:17
  
very informative.
Imran Tahir Lv4Posted 09 Dec 2023 09:35
  
Very informative thanks for sharing
Newbie451055 Lv2Posted 12 Dec 2023 15:59
  
thanks for the article
mdamores Lv3Posted 13 Dec 2023 13:18
  
very useful article

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