Closed Bug 244600 Opened 20 years ago Closed 20 years ago

Host not found because going through NetBIOS

Categories

(Core :: Networking, defect)

x86
Windows 2000
defect
Not set
major

Tracking

()

RESOLVED INVALID

People

(Reporter: wolruf, Assigned: darin.moz)

References

()

Details

Attachments

(3 files)

build ID: FF 20040522 on Win2k.

Steps to reproduce: extremelely random, I've seen this issue multiple times for
a few years and finally thought it could be a Mozilla issue, not a network
issue, so I captured some logs.

1. Browse some website, news.bbc.co.uk then zdnet.com in my case, browser had
been open for 2 hours,
2. At some point "host not found" shows up in Mozilla for an already visited
site (in my case, I had visited news.bbc.co.uk a few minutes before getting host
not found)

Workaround:
 - either closing Mozilla,
 - waiting for a few seconds enables Mozilla to properly re-enable name
resolution through DNS,
 - or starting IE, resolving news.bbc.co.uk, then going back to
Mozilla, it would resolve properly too.

I've seen this issue on 2 different Win2k machines.

A sniffer shows a NetBIOS query is issue for news.bbc.co.uk (instead of DNS),
not sure why, corrupted cache, DNS resolver cache, Mozilla not setting some
"flags" ?

I initiated a discussion on this on n.p.m.netlib.
I left the log intentionally 'large' (500K) as there may be interesting data
before the issue actually happen. The end of log corresponds to "Host not
found" message being displayed and Ethereal capturing the log (I then closed
the browser).
I still have the initial log (45MB) if some data is relevant.
This log was produced with FF 20040602 Win2k, after 20 min. of browsing, the
original log is 15MB large, I only attached the relevant log starting with
failure to resolve gamespy.com and zophar.net.

Was browsing http://codeblogs.ximian.com/blogs/evolution/ and
http://www.gamespot.com/features/6089278/index.html when I loaded a bookmark
pointing to
http://www.gamespy.com/articles/?constraint.grid.section=Hall+of+Fame and
loaded www.zophar.net manually in second tab.

I understand this is random but this may help understanding the DNS requests in
the log file.
As soon as I started these 2 requests, they anormally took a while and I got
the dialog "Host not found" on both. I immediately tried again, same result, 30
seconds later, it worked and resolved fine (I left the last 3 successful
seconds before closing FF, so this shows up at the end of the log).

Note: Ethereal wasn't opened at this time but I assume these host resolving
requests went through NetBIOS again.
It still happen for every day. An example today, Firefox stopped resolving for
20 seconds, as soon as I started another application using TCP/IP, XChat to
connect to irc.mozilla.org, then Firefox could resolve properly again (same
session and host names), being "unlocked".
Ben, Darin, any idea ?
Sounds like an OS problem to me.
reasons why I filed this bug report:
 - whenever you start another application, it automagically work again in Mozilla,
 - it seems to be totally random,
 - only seen this in Mozilla, not other IP applications: IE, etc.

then again, if you think (from the logs) it's an OS issue, I'm switching laptops
in a few weeks, will see if this issue still happen or if it's Win2k slowly
dying after 3 years of intensive usage. :)
New laptop T40 Win2k doesn't seem to exhibit this issue anymore using FF trunk 0.9+.
Status: NEW → RESOLVED
Closed: 20 years ago
Resolution: --- → INVALID
Isn't this that IPv6+DNS problem?
Whiteboard: dupeme
Whiteboard: dupeme
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