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Top Forums UNIX for Advanced & Expert Users Application showing "Connection Time Out" very often Post 303044590 by anaigini45 on Thursday 27th of February 2020 04:53:30 AM
Old 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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Qpsmtpd::Connection(3pm)				User Contributed Perl Documentation				  Qpsmtpd::Connection(3pm)

NAME
Qpsmtpd::Connection - A single SMTP connection SYNOPSIS
my $rdns = $qp->connection->remote_host; my $ip = $qp->connection->remote_ip; DESCRIPTION
This class contains details about an individual SMTP connection. A connection lasts the lifetime of a TCP connection to the SMTP server. See also Qpsmtpd::Transaction which is a class containing details about an individual SMTP transaction. A transaction lasts from "MAIL FROM" to the end of the "DATA" marker, or a "RSET" command, whichever comes first, whereas a connection lasts until the client disconnects. API
These API docs assume you already have a connection object. See the source code if you need to construct one. You can access the connection object via the "Qpsmtpd" object's "$qp->connection" method. new ( ) Instantiates a new Qpsmtpd::Connection object. start ( %args ) Initializes the connection object with %args attribute data. remote_host( ) The remote host connecting to the server as looked up via reverse dns. remote_ip( ) The remote IP address of the connecting host. remote_port( ) The remote port. remote_info( ) If your server does an ident lookup on the remote host, this is the identity of the remote client. local_ip( ) The local ip. local_port( ) The local port. hello( ) Either "helo" or "ehlo" depending on how the remote client greeted your server. NOTE: This field is empty during the helo or ehlo hooks, it is only set after a successful return from those hooks. hello_host( ) The host name specified in the "HELO" or "EHLO" command. NOTE: This field is empty during the helo or ehlo hooks, it is only set after a successful return from those hooks. notes($key [, $value]) Get or set a note on the connection. This is a piece of data that you wish to attach to the connection and read somewhere else. For example you can use this to pass data between plugins. clone([%args]) Returns a copy of the Qpsmtpd::Connection object. The optional args parameter may contain: no_reset (1|0) If true, do not reset the original connection object, the author has to care about that: only the cloned connection object is reset at the end of the connection relay_client( ) True if the client is allowed to relay messages. perl v5.14.2 2009-04-02 Qpsmtpd::Connection(3pm)
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