When I do a search I'm getting a prompt to download a file. If I do download the file it is blank. I wrote a full web server once in PHP. I'm pretty sure this effect is caused when the server responds with a partial header. In developing my web server I found a nice Firefox add on called 'Live HTTP Headers'.
Using 'Live HTTP Headers' add on I captured the following when trying to do a search for 'openvpn' I started from this url:
http://forum.pfsense.com/---------------------------------------------------------
http://forum.pfsense.org/index.php?action=search2POST /index.php?action=search2 HTTP/1.1
Host: forum.pfsense.org
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.11) Gecko/20071127 Firefox/2.0.0.11
Accept: text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5
Accept-Language: en-us,en;q=0.5
Accept-Encoding: gzip,deflate
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive: 300
Connection: keep-alive
Referer:
http://forum.pfsense.com/Cookie: __utmz=232063710.1199725322.23.6.utmccn=(referral)|utmcsr=forum.pfsense.org|utmcct=/index.php/topic,2718.60/topicseen.html|utmcmd=referral; __utma=232063710.472523203.1170219774.1198344525.1199725322.23; SMFCookie10=a%3A4%3A%7Bi%3A0%3Bs%3A4%3A%222470%22%3Bi%3A1%3Bs%3A40%3A%22d4720f5f793be3591f3ee89f16454f0a415e853e%22%3Bi%3A2%3Bi%3A1380484241%3Bi%3A3%3Bi%3A0%3B%7D; PHPSESSID=ff0d1db28f62a5f2489163262353cf23
Content-Type: application/x-www-form-urlencoded
Content-Length: 39
search=openvpn&submit=Search&advanced=0
HTTP/1.x 200 OK
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