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In these two rules, the -A option is used to refer to the chain the rules have to be added to. You are using -A, and so the rule is just appended to the INPUT and the OUTPUT chains. This would make the rule the last rule that is added to the chain, just before the policy that is always the last rule in a chain that is evaluated. Next, -i lo and -o lo are used to indicate that this rule matches to everything that happens on the loopback interface. As the third and last part of these two rules, the target is specified by using the -j option (which is short for jump to target ). In this case, the target is to accept all matching packets. So, now you have a server that allows nothing on the external network interfaces, but the loopback interface is completely open. Next, it s time to do what you want to do on your server: allow incoming SSH and HTTP traffic and allow replies to the allowed incoming traffic to be returned. Note that these two requirements consist of two parts: a part that is configured in the INPUT chain and a part that is configured in the OUTPUT chain. Let s start with some nice rules that define the input chain: iptables iptables iptables iptables -A -A -A -A INPUT INPUT INPUT INPUT -m -p -p -j state --state ESTABLISHED,RELATED -j ACCEPT tcp --dport 22 -m state --state NEW -j ACCEPT tcp --dport 80 -m state --state NEW -j ACCEPT LOG --log-prefix "Dropped illegal incoming packet: "

If the connection fails, you ll see an error message as in Figure 5-2. (You can get this by shutting down SSE first, with net stop mssql$sqlexpress entered at a command prompt. If you try this, remember to restart it with net start mssql$sqlexpress).

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You simplify the table references by providing a correlation name for each table. (This is somewhat similar to providing column aliases, but correlation names are intended to be used as alternative names for tables. Column aliases are used more for labeling than for referencing columns.) You can now refer to Orders as o and to Employees as e. Correlation names can be as long as table names and can be in mixed case, but obviously the shorter they are, the easier they are to code. You use the correlation names in both the SELECT list: select o.orderid, o.customerid, e.lastname and the ON clause: on o.employeeid = e.employeeid

The first rule in this INPUT chain tells Netfilter that all packets that are part of an already established or related session are allowed in. Next, for packets coming in on SSH port 22 that have a state NEW, the second rule indicates that they are allowed as well. Thirdly, packets that are sent to TCP destination port 80 (notice the combination between -p tcp and --dport 80 in this rule) and have a state NEW are accepted as well. The last rule finally makes sure that all packets that didn t match any of the earlier rules are logged before they are dropped by the policy at the end of the rule. Note that logging all dropped packets as a default may cause big problems.

Don t worry about the specifics of this message right now. Connections often fail for reasons that have nothing to do with your code. It might be because a server isn t started, as in this case, or because a password is wrong, or because some other configuration problem exists. You ll soon look at common problems in establishing database connections.

Open a New Query window in SSMSE (remember to make Northwind your query context). Enter the following query and click Execute. You should see the results shown in Figure 4-17. select o.orderid OrderID, c.companyname CustomerName, e.lastname Employee from orders o inner join employees e on o.employeeid = e.employeeid inner join customers c on o.customerid = c.customerid

Let s examine the code in Listing 5-1 to understand the steps in the connection process. First, you specified the ADO.NET and the SQL Server data provider namespaces, so you can use the simple names of their members:

Caution Use logging only if you need to troubleshoot your firewall. It s generally a bad idea to switch on

Then you created a connection string. A connection string consists of parameters in other words, key=value pairs separated by semicolons that specify connection information. Although some parameters are valid for all data providers, each data

First, you modify the SELECT list, replacing CustomerID from the Orders table with CompanyName from the Customers table: select o.orderid OrderID, c.companyname CustomerName, e.lastname Employee

logging by default, because, if not done properly, it can cause huge amounts of information to be written to your log files.

provider has specific parameters it will accept, so it s important to know what parameters are valid in a connection string for the data provider you re using:

' Set up connection string Dim connString As String = _ "server = .\sqlexpress;" _ & "integrated security = true;"

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