Forum not working with IE

Now (at least from 7:30 PM - 8:45 PM GMT) the board isn't working with IE, I'd made some test with quetannon to see what happens:

Test with IE wrote:

GET / HTTP/1.1
Host: board.flatassembler.net
User-Agent: Mozilla/4.0 (compatible; MSIE)

HTTP/1.1 200 OK
Date: Thu, 23 Mar 2006 20:07:05 GMT
Content-Type: text/html
Expires: Thu, 23 Mar 2006 20:07:05 GMT
Cache-Control: private, pre-check=0, post-check=0, max-age=0
Connection: close
Server: Apache/1.3.34 (Unix) FrontPage/5.0.2.2635 mod_ssl/2.8.25 OpenSSL/0.9.7d PowWeb/1.1
Pragma: no-cache
X-Powered-By: PHP/4.4.2
Set-Cookie: phpbb2mysql_data=a%3A2%3A%7Bs%3A11%3A%22autologinid%22%3Bs%3A0%3A%22%22%3Bs%3A6%3A%22userid%22%3Bi%3A-1%3B%7D; expires=Fri, 23 Mar 2007 20:07:05 GMT; path=/
Set-Cookie: phpbb2mysql_sid=b30388efb4c6f66a94acfa3e7a986760; path=/

After the HTTP response nothing more happens, some times only one packet with data arrives but in both cases the conections remains idle after.

Test with fake user agent wrote:

GET / HTTP/1.1
Host: board.flatassembler.net
User-Agent: Mozilla/4.0 (compatible; LocoDelAssembly)

HTTP/1.1 200 OK
Transfer-Encoding: chunked
Date: Thu, 23 Mar 2006 20:05:22 GMT
Content-Type: text/html
Expires: Thu, 23 Mar 2006 20:05:22 GMT
Cache-Control: private, pre-check=0, post-check=0, max-age=0
Server: Apache/1.3.34 (Unix) FrontPage/5.0.2.2635 mod_ssl/2.8.25 OpenSSL/0.9.7d PowWeb/1.1
Pragma: no-cache
X-Powered-By: PHP/4.4.2
Set-Cookie: phpbb2mysql_data=a%3A2%3A%7Bs%3A11%3A%22autologinid%22%3Bs%3A0%3A%22%22%3Bs%3A6%3A%22userid%22%3Bi%3A-1%3B%7D; expires=Fri, 23 Mar 2007 20:05:22 GMT; path=/
Set-Cookie: phpbb2mysql_sid=d64627ebdd273fa55458578d1aa7de6b; path=/

2000
.
.
.

This time I successfully downloaded the board index. Something strange I found on this is that with MSIE user-agent the transfer-encoding is not chunked.

Someone else are having problem with IE on this forum or I must give thanks to the transparent proxy of my ISP again?

Now I'm posting with Opera configured to identify it self as Opera instead of IE because of the above.

Regards

PS: Note that regardless of the version of MSIE always happen the same (I tested with the browser and capturing with ethereal too and I see the same problem).