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
qpsmtpd::connection
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)