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Chromium and Other Browsers Not Working For Specific Host

Eric | Last updated: Jan 20, 2022 04:36PM UTC

I have an issue where Chromium, Chrome, and Edge all give me the same error on an internal website that I need to test. The specific error is below. "Hmmm… can't reach this page It looks like the webpage at [redacted] might be having issues, or it may have moved permanently to a new web address. ERR_HTTP2_PROTOCOL_ERROR" The site does not have a valid SSL certificate, so browsing to it normally requires me to ignore that error and proceed. I can view the site fine in any browser (except chromium) but as soon as I try to send traffic through burp I receive the above error, but ONLY for this internal site. Any other site works fine. Other internal sites also work fine. If I capture the initial request to view the site and send it to the repeater and then send the request from there I get a 200 response and can see the html of the page. If I copy that response to view in browser I receive the same error as above again. For some reason this WILL work in internet explorer 20h2, but the site does not render properly and interfaces I need to work with are missing. Any ideas? I do have burp's CA certificate installed. I am using burp professional.

Eric | Last updated: Jan 20, 2022 06:48PM UTC

FYI the solution was found, for anyone searching, the repeater seems to default to http/1 while the default proxy listener uses http/2. Editing the listener to remove support for http/2 fixes the issue in this particular instance.

Michelle, PortSwigger Agent | Last updated: Jan 21, 2022 03:20PM UTC