Firefox trying to DNS resolve a Kerberos protected domain, even if using a proxy

UNCONFIRMED
Unassigned

Status

()

Core
Networking: DNS
P3
normal
UNCONFIRMED
2 years ago
10 months ago

People

(Reporter: CSN, Unassigned)

Tracking

45 Branch
Points:
---

Firefox Tracking Flags

(Not tracked)

Details

(Whiteboard: [necko-backlog])

(Reporter)

Description

2 years ago
User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/54.0.2840.99 Safari/537.36

Steps to reproduce:

Firefox on windows 7, using system parameters for proxy.
When i try to access a Kerberos protected page (through a proxy), i can see a DNS request for the server FQDN.



Actual results:

When looking network trafic with wireshark, I can see the client ask for the page, the server answers it's waiting for Negotiate auth.
The client then tries to resolve the server FQDN.
If the DNS gives answer, Kerberos trafic occurs, the system gets the TGS and the page is loaded.
If the DNS does not answer, the HTTP/401 is displayed, and nothing happens after the DNS request failure.

The same operation with Internet Explorer does not make any DNS request, and does the Kerberos usual traffic.


Expected results:

Firefox should not ask for any DNS resolution, as it is using a proxy.

This "bug" (feature ?) seems pretty similar to this one : https://bugzilla.mozilla.org/show_bug.cgi?id=890717

Updated

2 years ago
Component: Untriaged → Networking: DNS
Product: Firefox → Core
Whiteboard: [necko-backlog]
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