Zhao, Have you tried working with 2.6.20 (along with Ian's patches)? I recall having similar problems with versions other than 2.6.20. Also getting Gerrit's latest tree should fix your problems. BTW, DCCP Linux Implementation mailing list, which is included in Cc, is a better place to post such mails. BR -- Burak ----- Original Message ---- From: jerry zhao <zhj.zhao@xxxxxxxxx> To: dccp@xxxxxxxx Sent: Wednesday, January 9, 2008 5:36:18 PM Subject: RE: [dccp] question about CCID3 >You are probably behind a firewall. >B.R. >Vladimir. Hello Vladimir., thanks for your reply. I don't think firewall is the reason. Because I have tested the performance of DCCP when ccid2 was used. In this situation, the DCCP worked fine. Now, I attached the result of CCID2 to the attachment. Best regards, Zhao - To unsubscribe from this list: send the line "unsubscribe dccp" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html