02-27-2020
Application showing "Connection Time Out" very often
Hi,
We have a web serveer running on Apache-Tomcat-6.0.32. For 2 months continuously, we noticed that the app on this server setup has been frequently sending out intermittent "Connection Time Out" issues.
On the OS side, I investigated a lot of things,
1) tcpdump : did not find anything suspicious (no large flooding of suspicious IP, etc)
2) In the apache access_log nothing suspicious either.
3) netstat -an, tulpn : No timeout/dead connection
4) telnet to port 80 is OK
Thus, my teammate concluded that it could be a bug in the tomcat version 6.0.32 itself. Is this possible/true? How can we confirm this?
We use "Uptime" as a monitoring tool, and it sends updates every 3 mins. Whereas other monitoring tools send alerts every 5 mins or more, and do not show the "Connection Time Out" problem.
Is "Uptime" an unstable monitoring tool?
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LEARN ABOUT DEBIAN
mrtg-webserver
MRTG-WEBSERVER(1) mrtg MRTG-WEBSERVER(1)
NAME
mrtg-webserver - hints for web server configuration
SYNOPSIS
If you want people to actually see the results of your network monitoring efforts you will need a webserver.
This document lists some configuration hints for webservers. Contributions welcome.
APACHE
Configuring mod_expire
A big issue with mrtg monitoring data is the expiry time. All these nice graphs you can create are only valid for a short time. If you do
not take special action some webbrowsers will not notice this and you may end up with people seeing old data because of caching issues.
The apache module mod_expire allows you to setup special expiry properties for individual file.
Here is an example for how this may look for an mrtg web directory. The configuration directives can be stored into a .htaccess file.
############################################################
# Example .htaccess for use with apache-1.2 and mod_expire.
# (mod_expire come with apache-1.2 but you have to explicitly
# activate it when compiling the httpd ...)
#############################################################
#
<Files "*-day.png">
ExpiresActive On # enable expirations
# five minutes
ExpiresDefault M300
</Files>
<Files "*-week.png">
ExpiresActive On
ExpiresDefault M1800
</Files>
<Files "*-month.png">
ExpiresActive On
ExpiresDefault M7200
</Files>
<Files "*-year.png">
ExpiresActive On
ExpiresDefault M86400
</Files>
<Files "*.html">
ExpiresActive On
ExpiresDefault M300
</Files>
# index.html is not automatically generated
<Files "index.html">
ExpiresActive Off
</Files>
AUTHOR
Unknown
2.17.4 2012-01-12 MRTG-WEBSERVER(1)