Last modified: 2006-12-27 23:54:32 UTC

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Bug 8401 - false-positives on SORBS DNSBL when editing MW1.9 pages from dynamic IP's
false-positives on SORBS DNSBL when editing MW1.9 pages from dynamic IP's
Product: MediaWiki
Classification: Unclassified
Page editing (Other open bugs)
PC Linux
: Normal normal (vote)
: ---
Assigned To: Nobody - You can work on this!
: 8402 (view as bug list)
Depends on:
  Show dependency treegraph
Reported: 2006-12-27 17:21 UTC by Carl Austin Bennett
Modified: 2006-12-27 23:54 UTC (History)
0 users

See Also:
Web browser: ---
Mobile Platform: ---
Assignee Huggle Beta Tester: ---


Description Carl Austin Bennett 2006-12-27 17:21:34 UTC
User blocked: Your user account or IP address have been blocked by SORBS DNSBL;
IP is listed as an SORBS DNSBL open proxy. You may contact SORBS DNSBL or one of
the other administrators... your IP address is

Server configuration is: 
 MW1.9-svn (current as of yesterday), recently upgraded from MW1.8alpha
 one standalone dedicated server, Fedora5, using both memcached and squid on
same localhost (
 Apache's bound to, Squid is bound to :80 on one of the
datacentre's external static IP's

So, enable SORBS on MW1.9 and suddenly it won't let me edit any page from my
dynamic IP address.

This is happening only on wikis that I've upgraded to MW1.9alpha and then only
if I try to edit any page on these sites from a dynamic IP connection (PPPoE in
my case). It broke as soon as I upgraded to 1.9

If I edit by running lynx on a shell account on the server, everything works
fine and any edit appears in recentchanges as the server's external static IP. 

It just doesn't want to let me edit from a dynamic IP.

Turning off $wgEnableSorbs makes the error go away, evidently.

I'd tried looking up my own address on SORBS' site and it reports the block as a
dynamic IP range (ADSL or dialup) but not as anything else particularly nasty.
And no, I'm not seeing this on MW1.8, just on the new upgrade.
Comment 1 Carl Austin Bennett 2006-12-27 18:40:02 UTC
*** Bug 8402 has been marked as a duplicate of this bug. ***
Comment 2 Brion Vibber 2006-12-27 18:47:10 UTC
I don't get any matches testing with a few random IPs in the range you gave.

Please give an exact IP address to test.
Comment 3 Carl Austin Bennett 2006-12-27 20:35:59 UTC
My current IP is (client) 

I can edit unless $wgEnableSorbs = true; is present, using today's MW 1.9 SVN
Comment 4 Tim Starling 2006-12-27 20:43:26 UTC
SORBS has many false positives, probably more than the number of true positives.
You shouldn't use it unless you don't mind blocking those people. This is not a
bug in MediaWiki, it is either a configuration problem on your wiki (i.e. the
fact that you have SORBS enabled), or a problem with the SORBS delisting policy,
depending on the way you look at it. Please address complaints about SORBS
itself to .
Comment 5 Carl Austin Bennett 2006-12-27 20:52:50 UTC
SORBS lookup directly on the website claims that this
address is not an open proxy.
Comment 6 Brion Vibber 2006-12-27 22:18:43 UTC
I don't get a match using the MW code either:

$ php maintenance/eval.php 
> return $wgEnableSorbs;
> return $wgSorbsUrl;
> return $wgUser->inSorbsBlacklist( '' );

Can you confirm?

Also try the lookup manually:

$ host
Host not found: 3(NXDOMAIN)

Previous versions of MW did the lookup with a hardcoded "",
so also try with the extra . at the end:

$ host
Host not found: 3(NXDOMAIN)
Comment 7 Carl Austin Bennett 2006-12-27 23:12:06 UTC
$ php maintenance/eval.php
PHP Warning:  posix_isatty(): cannot seek on a pipe in
/var/www/html/fr/ on line 66
> return $wgEnableSorbs
> return $wgSorbsUrl
> return $wgUser->inSorbsBlacklist('')

$ host
Host not found: 3(NXDOMAIN)
$ host
Host not found: 3(NXDOMAIN)

(version is MediaWiki: 1.9alpha, PHP: 5.1.6 (apache2handler), MySQL: 5.0.22)
Comment 8 Carl Austin Bennett 2006-12-27 23:25:43 UTC
I'm looking at "includes/User.php" line 898 of 2519:

$ipList = gethostbynamel( $host );

on call, $host was ''
on return, $ipList[0] becomes '' - which is the address of the
wiki server.

$ php maintenance/eval.php

> return gethostbynamel('')
array(1) {
  string(15) ""
Comment 9 Carl Austin Bennett 2006-12-27 23:27:39 UTC
$ php maintenance/eval.php
PHP Warning:  posix_isatty(): cannot seek on a pipe in
/var/www/html/fr/ on line 66
> return gethostbynamel('')
array(1) {
  string(15) ""
Comment 10 Brion Vibber 2006-12-27 23:28:58 UTC
Sounds like you've got a weirdly broken local DNS or something. Check
/etc/resolv.conf and /etc/hosts...?

Also check if adding the . on the end changes the result.
Comment 11 Carl Austin Bennett 2006-12-27 23:36:56 UTC
Ah, so the trailing . on is necessary, according to

"User Contributed Notes - gethostbynamel - info at -
29-Sep-2006 06:27
 The solution is simple. Just add a . (point) to the end of the URL for correct
name resolving.
 Without this point PHP thinks it's a subdomain of your local domain and so
returns the "local-IP"."

> return gethostbynamel('')

Therefore, in "includes/DefaultSettings.php" line 2075 of 2343, just change from:
  $wgSorbsUrl = '';
back to:
  $wgSorbsUrl = '';
and all is well.
Comment 12 Brion Vibber 2006-12-27 23:54:32 UTC
Ah I see, looks like your local domain has a wildcard of some sort, so the
negative lookups fall back to the localdomain and always come up with a positive
result. :)

Fixed in r18616.

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