https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=217637
Bug ID: 217637
Summary: One TCP connection accepted TWO time
Product: Base System
Version: 10.3-STABLE
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: freebsd-bugs@FreeBSD.org
Reporter: alexandre.mart...@stormshield.eu
Created attachment 180626
--> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=180626&action=edit
tcpdump from the client side view
Hello,
I currently having a strange problem, my web server accept two time the SAME
tcp connection.
After digging, it's due to a TCP retransmission. There is the TCP scenario:
Client | SERVER | Comment
SYN ------------->
<------------- SYN/ACK
ACK -------------> Connection accepted in the server
PUSH/ACK --------> POST /someURL HTTP/1.0\r\nContent-length:
10\r\n\r\n
<------------- PUSH/ACK 500 error
<------------- FIN/ACK Connection closed in the server
PUSH/ACK --------> data of the post
<------------- RST This reset seems to be lost or filtered by some
firewall
PUSH/ACK --------> Re-xmit all: POST /someURL
HTTP/1.0\r\nContent-length: 10\r\n\r\ndatadatada
?????????? =======> this cause the connection to be RE-ACCEPTED by
the server !?!?!
ACK -------------> Ack the 500 error message
ACK -------------> Ack the FIN
<------------- ACK This ACK seems BROKEN. The TCP sequence mismatch
And the connection never close properly until the TCP timeout.
I attach the tcpdump of this connection from the client side.
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