280997 - Autoconfiguration script hangs up Firefox process

Status: RESOLVED WORKSFORME

(Firefox :: General, defect)

Description

[Maksim Korzhanov]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8b) Gecko/20050203 Firefox/1.0+
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8b) Gecko/20050203 Firefox/1.0+

Use of http://garmtech.lv/proxy.pac autoconfiguration script makes my Firefox
hang up if address isn't resolvable at all (for example www.asdas.asd).

Reproducible: Always

Steps to Reproduce:
1. Autoconfigure http://garmtech.lv/proxy.pac as autoconfiguration script
2. Visit any unresolveable hostname.

Actual Results:  
Mozilla stops responding. Can be only closed by Task Manager.

Expected Results:  
Show "Host not found" page.

The same error on: Mozilla/5.0 (Windows; U; Windows NT 5.1; ru-RU; rv:1.7.5)
Gecko/20041108 Firefox/1.0 (with ru-RU interface build).

Comment 1

[Maksim Korzhanov]

Attachment: Autoconfiguration file

This's original proxy autoconfiguration script.

Comment 2

[Alexey N. Solofnenko]

I blame this problem with Firefox freezing when configured with automatic proxy
discovery with Google Accelerator. It happened with Mozilla/5.0 (Windows; U;
Windows NT 5.1; en-US; rv:1.8b4) Gecko/20050803 Firefox/1.0+, but also with
Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8b4) Gecko/20050801
Firefox/1.0+ after I returned to the previous version.

Comment 3

[Dmitry Liakh]

There are about 60 users suffering from this bug in our corporate network. :-\

I digged a little for the reason of the problem and found that
 * this bug affects only Windows platform
 * when browser hangs, machine sends broadcast packets to the network trying to resolve the (non-existent) hostname over NetBIOS!

 I tried to reproduce the bug on Windows XP and Windows Server 2003, using two
browsers I had installed at the moment of testing: 
 1. Mozilla/5.0 (Windows; U; Windows NT 5.2; ru; rv:1.8.0.1) Gecko/20060111 Firefox/1.5.0.1
 2. Mozilla/5.0 (Windows; U; Windows NT 5.2; ru-RU; rv:1.6) Gecko/20040407

 -- both browsers hangs on both OSes when trying to load a page that have an unresolvalble hostname in URL.

The browser quits hung state once it can resolve the name. I tried to
add a record to %systemroot%\system32\drivers\etc\hosts that maps bad hostname caused browser to hang to any IP, 127.0.0.1 for example, and browser immediately unlocks.

Our proxy autoconfiguration script is at http://www.hansa.kiev.ua/proxy.pac (it's long automatically generated using a list of network prefixes script very similar to the one that is attached by reporter)

P.S. I didn't install any third party browser *extensions* before testing, just browser itself and nothing more

Comment 4

[William Bumgarner [:zsinj]]

Is this bug still reproducable? Please upgrade to a newer version of Firefox, preferably a nightly testing build available at http://www.mozilla.org/developer and report back with your results. Thank you.

Comment 5

[Maksim Korzhanov]

Tested on "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-GB; rv:1.8.0.7) Gecko/20060909 Firefox/1.5.0.7". As for me bug has been resolved (tested with attached file).

---cut---
Proxy Error

The proxy server received an invalid response from an upstream server.
The proxy server could not handle the request GET http://www.garmtech-has-no-other-domains-than.lv/.

Reason: DNS lookup failure for: www.garmtech-has-no-other-domains-than.lv
---cut---

Comment 6

[Samuel Sidler (old account; do not CC)]

Since this bug now works for the reporter, I'm going to resolve it as "works for me". If you see this issue again using Firefox 2.0.0.3 or later, please file a new bug with steps to reproduce and a reference to this bug.