They know I'm using a proxy(Tor)...but how?

[Geoff Down]

FYI when I was running a relay (not an exit node) I was blocked 
(dynamically) from one site at least, presumably using the list at 
Moria. Unfair.
GD
On 1 Dec 2008, at 06:03, Karsten N. wrote:

> Hi gregery,
>
> torproject.org supports two solution, to help webmasters to protect
> theire service for anonymous missuse.
>
> 1: Have a look at https://www.torproject.org/tordnsel
>    It is a dynamic DNSBL with all tor exit nodes.
>
> 2: https://check.torproject.org/ offers an dynamic list
>    of all tor exit nodes, which can connect to a webserver.
>    (xx.xx.xx.xx has to be replaced by the IP of the webserver)
>
>  http://check.torproject.org/cgi-bin/TorBulkExitList.py?ip=xx.xx.xx.xx
>
> Both service are using a IP list of tor exit nodes. Your settings in
> your browser are ok.
>
> Karsten N.
>
> gregery schrieb:
>> Hey all,
>>
>> I am trying to register at a website forum and I get an error message
>> when I try to register.  The message basically says that it seems I am
>> using an anonymous internet connection or a proxy.  The site is not
>> blocking Tor by exit-node because I get the same error message when I
>> try to register at the site while using a public high-anonymous elite
>> proxy (L1).  I think the forum administrator is using headers to 
>> decide
>> if a new member is using a anonymous connection or not.
>>
>> I use the current TorBrowser Bundle with current TorButton and
>> RefControl to spoof the referrer headers.  I also use vanilla Tor,
>> Vidalia and Privoxy with the same result.  I tired spoofing my
>> user-agent away from the default TorButton U-A settings, I spoofed as 
>> a
>> Mac, Firefox, IE, Opera, etc, all for not.
>>
>> Does anyone know how I can circumvent this block?  I at least would 
>> like
>> to know what in my headers is setting off red flags as that means all
>> other Tor users in my anonymity set are potentially setting off red
>> flags too.
>>
>> Thank you
>