1767630 - Unable to access Commerzbank bank account

Status: RESOLVED FIXED

(Web Compatibility :: Site Reports, defect, P3)

Description

[Francesco Lodolo [:flod]]

With Firefox, after providing username and password, you get a "Technical error page" and the login fails. Normally, it would display a page while it waits for you to confirm the login with your photoTAN application.

The login was broken on Nightly for a while for me, but now even release doesn't work (Firefox 100). Not sure if this can be tracked down to a feature that was enabled by default in 100?

The profile is pretty clean (no add-ons), tried also with Tracking Protection disabled. Nothing useful in the console either.

Comment 1

[BugBot [:suhaib / :marco/ :calixte]]

The Bugbug bot thinks this bug should belong to the 'Core::Privacy: Anti-Tracking' component, and is moving the bug to that component. Please correct in case you think the bot is wrong.

Comment 2

[Emma Zühlcke [:emz]]

Did you toggle ETP off via the toggle in the protections panel (shield icon)? And if you do that, does the issue still occur?

Comment 3

[Francesco Lodolo [:flod]]

(In reply to Paul Zühlcke [:pbz] from comment #2)

Did you toggle ETP off via the toggle in the protections panel (shield icon)?

Correct, and that doesn't fix the error.

Aryx is seeing the same thing, and trying to bisect. Are you aware of any default setting that changed from 99 to 100?

Comment 4

[Emma Zühlcke [:emz]]

OK, so it's probably not anti-tracking related then. I unfortunately don't have a Commerzbank login so I can't test.

Comment 5

[Sebastian Hengst [:aryx] (needinfo me if it's about an intermittent or backout)]

This breaks if version 100 is used in the useragent. If one sets the preference general.useragent.override to Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:99.0) Gecko/20100101 Firefox/99.0, the login succeeds.

Comment 6

[Francesco Lodolo [:flod]]

Maybe easier for folks affected: set network.http.useragent.forceVersion to 99 (default should be 0). Needs a browser restart to take effect.

Comment 7

[Dennis Schubert [:denschub]]

This is User Agent sniffing. We can ship a WebCompat Intervention here to cap the UA to Version 99, until they have a chance to fix. Most likely, this is important enough for an out-of-band update.

Comment 8

[Dennis Schubert [:denschub]]

We're rolling out a System Addon Update (see bug 1767811) that addresses this issue for Release users. The same intervention is also shipping in Nightly. Uplift into Beta is pending.

Comment 9

[Dennis Schubert [:denschub]]

We have shipped a User Agent override, which is available in all channels. This is still a valid issue that should remain open as we're still waiting for them to react, but since this needs no immediate action from the WebCompat team, I'll drop the priority for now.

Comment 10

[Calin Tanase]

Francesco, could you please test this issue with a clean profile on the latest Firefox Nightly with the following settings in "about:config"?

"about:config" settings:
extensions.webcompat.perform_ua_overrides false
extensions.webcompat.perform_injections false

Comment 11

[Francesco Lodolo [:flod]]

It seems to be working now (Firefox 110.0a1, Build ID 20230112093539)