I use Mantis with SVN. Pretty much as that link says, though I put the regexp in the post-commit so it doesn't try to update the bug if the commit message is not relevant, that makes non-bug-updating commits respond slightly faster.
My Mantis install is on a different server too. I use curl to call the php method in Mantis 1.1.6.
Put this in your post-commit.cmd hook (you'll need to download strawberry perl and grab perl.exe and perl510.dll from it, you don't need the rest)
c:\tools\perl c:\tools\mantis_urlencode.pl %1 %2 > c:\temp\postcommit_mantis.txt
if %ERRORLEVEL% NEQ 0 exit /b 0
c:\tools\curl -s -d user=svn -d @c:\temp\postcommit_mantis.txt http://swi-sgi-l-web1.ingrnet.com/mantis/core/checkincurl.php
and put this in mantis_urlencode.pl
$url = `svnlook log -r $ARGV[1] $ARGV[0]`;
# check the string contains the matching regexp,
# quit if it doesn't so we don't waste time contacting the webserver
# this is the g_source_control_regexp value in mantis.
exit 1 if not $url =~ /\b(?:bug|issue|mantis)\s*[#]{0,1}(\d+)\b/i;
$url = $url . "\n" . `svnlook dirs-changed -r $ARGV[1] $ARGV[0]`;
#urlencode the string
$url =~ s/([^\w\-\.\@])/$1 eq " "?"+": sprintf("%%%2.2x",ord($1))/eg;
print "log=$url";
exit 0;
If you want to migrate from VSS, there are a load of scripts, including one I wrote on codeplex.
It all works well, we use it all the time, and its quick enough not to notice its there. Just type "Fixed Mantis #1234" and it resolves the bug and adds a bugnote to it. The script also adds the directories that were modified to the bugnote too (I tried showing changed files but too many detract from easy understanding)