Issue abstract: ERR_HTTP2_INADEQUATE_TRANSPORT_SECURITY
Detailed description: Recently more web pages are blocked with “ERR_HTTP2_INADEQUATE_TRANSPORT_SECURITY” error and I am unable to open those pages unless I add them to safe/exclude list.
Product & version number: Norton 360 Standard
OS details: Windows 11 Home 24H2
What is the error message you are seeing? ERR_HTTP2_INADEQUATE_TRANSPORT_SECURITY
If you have any supporting screenshots, please add them:
Are you using Chrome? Is Chrome giving you this message or is it from Norton? Chrome FULLY supports the HTTP2 protocol since version 49, its enabled by default too, something has to be blocking between you and the websites you are visiting. Running a VPN maybe and/or ad blockers? Have you disabled HTTPS traffic sniffing in Norton? Please advise.
SA
I’m using Brave browser (any other browsers work fine). If I add the web pages that gives me this error to the Norton “Exclusions” list I can open the pages.
Please have a look at this article:
Asked previously if you have disabled HTTPS traffic sniffing in Norton?
SA
If I disable HTTPS scanning it works fine. Is this the only solution? What are the risks of disabling this feature?
Its a known issue in the latest Norton versions. Being disabled can open avenues for MIM attacks because any certificate on a website will be allowed. Did you give disabling http2 in Brave instead?
SA
Thank you for the clarification. I have tried disabling HTTP2 in Brave as well which works but can’t be sure which one is safer (disabling in Norton or Brave).
Disabling in Brave would be the safer instance to choose.
SA
I’m having the same issue and after capturing some logs it appears Norton intercepts the SSL traffic and tries to downgrade the ciphers with weaker ciphers not accepted by the browser for HTTP2… Is there an official response from Norton regarding this behavior?
Nothing official or unofficial on the part of the Norton team thus far. Its being discussed in other threads as well:
SA