K J.Sreekumar wrote:
Hello All,
We are hitting on a weird problem with tomcat 6 production server (which is
a serious concern for us now). Hoping to get help from the you guys
This is the problem -
1. Our tomcat 6 server (version 6.0.29) does not respond after working
for a couple of days. Browsers are unable to find application URLs (which
were previously processed normally).
2. The logs does not show any error.
3. There are only a total of 50-60 threads in the thread dump, mostly in
WAIT state. Also, it does not show any BLOCKING or LOCKED threads.
4. Memory utilization was 400MB only
5. TOMCAT restart does not fix the problem. The machine needs to be
restarted to resume normal operation.
6. Netstat did not reveal any extraneous connections
We are running Tomcat 6.0.29 on the following platform -
OS: Windows server 2003 R2 Enterprise Edition SP2
Hardware: Intel Xeon L5520 2.27 GHz (16 CPU threads )
The fact that restarting Tomcat does not help, and that there is no error in the logs,
raises a strong suspicion that the problem may be external to Tomcat.
So, just to eliminate certain side-issues :
1) what do you mean by :
> 1. ... Browsers are unable to find application URLs (which
> were previously processed normally).
What error do you get in the browser ? (Preferably, use a browser other than IE, or if you
do use IE, then in the options disable the "friendly error messages")
2) When the problem happens again :
- does the host still respond to "ping" ?
- on the server, in a command window, do : netstat -p tcp -anb
and paste the complete result here
- from another workstation :
- open a command window
- enter : telnet (hostname) (port) (the port on which Tomcat listens,
presumabyl 80)
you will not get a prompt, you will get a blank screen.
- now you have to type blind, because you will not get an echo :
GET / HTTP/1.1
<CR>
<CR>
(meaning 2 times "return"
what do you see ?
- do the same from a command window on the server itself, using "localhost" as the
hostname. Same result ?
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