http - firefox ipv6 connection failed while tcp layer connected -

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I am trying to connect with IPv6 Link-Local address from Windows XP SP3 to Firefox 6. IPv4 address of the service works well, IPv6 connection failed with failed error.

By wirehaark, it is celebrated as sequence: 

  direction protocol port transmission 1. Customer - & gt; Server: TCP 1061- & gt; 80 [syn] 2. Servers - & gt; Client: TCP 80-> 1061 [syn, ack] 3. Client - & gt; Server: TCP 1061- & gt; 80 [ack] 4. Client - & gt; Server: http [Receive] 5. Server - & gt; Client: http [200 OK]   
 In the 5th transmission, the requested HTML file is included. But the browser connection failed. It seems that TCP receives the layer message and can not deliver it to the HTTP layer or the browser. I've disabled the firewall, and the results are the same.  
 Can someone give a clue or a hint to follow? Thank you.   
 
 
 I suspect that this is not a complete reaction in packet 5.  
 Usually this type of problem is due to broken path MTU discovery. If the path has a tunnel then the MTU is probably smaller than 1500 bytes, which means 1480 bytes. All packs are smaller than 1480 bytes when the server sends 1500 byte packets so it will be very big for the tunnel. Tunnel router sends back packet-huge ICMP error, and the server sends data to 1480-byte segments. If ICMP error never arises or firewalls block ICMP packets, then the server never learns that it should send a small packet, it keeps sending large packets, and they never reach ...  
 Such problems are due to a misconfigured firewall, sometimes this hardware or software is broken.

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