rdlc data matrix

rdlc data matrix

rdlc data matrix

rdlc data matrix

rdlc data matrix

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As you can see, netstat provides a complete overview of what s happening on your server. It s especially useful if you get error messages like port already in use. In combination with the grep utility, it s easy to learn what port program is currently holding a port open and, if required, to terminate that program. For example, to find out what program is currently occupying port 80, use netstat -platune | grep 80. This returns a line like root@ZNA:~# netstat -platune | grep 80 tcp 0 0 0.0.0.0:80 0.0.0.0:* 13209 3965/apache2 LISTEN 0\

4, Querying Multiple Tables : This chapter demonstrates several techniques to use data from more than one table in the same query 5, Grouping and Summarizing Data : This chapter teaches how to write aggregate queries Aggregate queries allow you to group data and use special functions, such as SUM and COUNT, that operate over groups of data 6, Manipulating Data : Because you will need to modify data as well as retrieve it, this chapter teaches how to insert new rows and update or delete existing rows..

From this line, you can see that an Apache web server with a PID of 3965 is currently listening on port 80. Want to remove it Use kill 3965 and it s gone.

The filter declares the paths that must be secured from eavesdroppers and delegates to the channel decision manager to determine whether these rules are in force. The syntax for the filterInvocationDefinitionSource property, which is used to specify the channel security level required for the various paths, is similar to that required to specify the filter chain to apply to paths in Listing 7-2 and the roles required to access the paths in Listing 7-5. The definitions in Listing 7-16 define the channel security level that is required. It is not possible for a channel to be simultaneously secure and insecure, so you must not specify both REQUIRES_SECURE_CHANNEL and REQUIRES_INSECURE_CHANNEL for any path. Specifying REQUIRES_INSECURE_CHANNEL will actively redirect an incoming secure request to the insecure port. If instead you are prepared to let the user dictate the level of security to be applied to a particular path, you should ensure that neither of the channel security processors is specified for the path in question. Listing 7-17 shows the configuration of the channel decision manager.

The netstat command is a useful tool, but it works only on the host where you run it. Sometimes, when you cannot connect to a given service on a given host, you d like to know if the service is available at all. You can do this with the nmap command. (Use apt-get install nmap to install it.) Like most powerful network tools, nmap also works best if you are root. The nmap command is an expert tool that helps you find out exactly what s happening at another host. If you use it properly, the owner of that host will never even know that you were there. However, you should be aware that running a so-called port scan to monitor open ports on a given host is considered an intrusion by many administrators, so be careful what you re doing with it because you may run into trouble if you use nmap on a host that isn t yours and you haven t notified its owner. If you really want to keep things simple, just use nmap without arguments. For example, nmap 192.168.1.69 performs a basic scan on host 192.168.1.69 to find what common ports are open on it. This gives good results for day-to-day use; see Listing 8-15 for an example. Listing 8-15. The nmap Command Shows You What Services Are Offered by a Host. root@ZNA:~# nmap 192.168.1.69 Starting Nmap 4.20 ( http://insecure.org ) at 2007-08-01 11:08 EDT Interesting ports on 192.168.1.69: Not shown: 1693 closed ports