https://issues.apache.org/bugzilla/show_bug.cgi?id=53237
Priority: P2
Bug ID: 53237
Assignee: dev@tomcat.apache.org
Summary: TCP connections are stuck in SYN_RECV
Severity: normal
Classification: Unclassified
OS: Linux
Reporter: wilbra...@iivip.com
Hardware: All
Status: NEW
Version: 1.1.22
Component: Library
Product: Tomcat Native
Created attachment 28783
--> https://issues.apache.org/bugzilla/attachment.cgi?id=28783&action=edit
test reproduction file
When a TCP connection is opened to a tomcat (6 & 7) instance with tomcat-native
installed, the connection is left in 'SYN_RECV' until a request is made or the
connections is cleared (within 4 minutes on my system).
If tomcat-native is not installed on that same system, the TCP connection goes
to the 'ESTABLISHED' state.
The client system where the connection is originating sees the connection as
'ESTABLISHED' and will get errors if it has waited longer than the time before
the SYN_RECV connection is cleared to make it's request.
I've attached a small program that shows the error scenario.
1) Compile and run the attached socketTest.java passing in a hostname/ip as
the first argument and a port as the second argument. i.e. 'java socketTest
<host> <port>'
2) Run netstat on the system running tomcat/tomcat-native to see the socket
connection status. I used a bash while loop: 'while true; do date; netstat |
grep 8080; sleep 10; done'.
With tomcat-native installed I would see:
tcp 0 0 <server>:8080 <client>:62848 SYN_RECV
With no tomcat-native installed I would see:
tcp 0 0 <server>:8080 <client>:62848 ESTABLISHED
tomcat-native should not prevent these connections from moving to 'ESTABLISHED'
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