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Can anyone help me?

How can I block Yahoo messenger and MSN messenger by using iptables? Thanks.

Any idea?

Well, thanks first. I know that I can block the address of an webmail by using iptables if I know the webmail address. However my main problem is that there are lots of webmail in the internet. It is impossible to get all of the ip addresses and block them by iptables. Also, if the webmail...

I need to block all the webmail access not the IMAP. So I can't just use iptables to complete my task since I can't get the all the webmail ip from the internet. I need to block webmail not IMAP. Although most of the webmail use IMAP to connect to their server, they use IMAP locally and just...

MySQL 4.0 or MySQL 4.1? MySQL 4.1 supports subquery but it is still a beta version. Any recommandation? Thanks.

How to block the internal client to access the webmail in the internet? Can squid do that? Thanks.

What is the exact meaning of thread-safe? And, how do I know my code is thread-safe and how to write the thread-safe code? Thx.

If a master table and a detail table is linked one-to-many, what is the behaviour of the detail TTable /TADOTable? Is it retrieving all the records and then filter the corresponding records? Or, just retrieve the corresponding records from the table? Thx.

If I use TTable / TADOTable with filter property, the filtered records are displayed. Is the dataset retrieving all the records in the table and just display the filtered records to us? Or, it only retrieve the filtered records from the table and with a new retrival if I changed the filter...

My system is running RH7.3. I am getting the following error when running fsck on hdc10. I can't access it. How can I get my data back from this partition? Attempt to read block from filesystem resulted in short read while checking ext3 journal for /dev/hdc10 Pls help. Thx.

Is it ok by using varchar in ttx file for CR 8.0? There is no varchar option in TTX file designer.

I am using crystal report 8. I want to use ttx definition file instead of linking to database in design time. Can anyone tell me what is the mapping of the field types in crystall report and the real table field type? For example, I don't know what field type should I use in Crystal Report...

What is the difference between using a unit after interface section and implementation section? When should I place a uses statement after interface and after implementation? Ex: unit MyUnit; interface uses Windows, Messages, SysUtils, Forms, MyUsesUnit; // uses here? .... .... ...

Any tools can resize ext3 partition just like Partition Magic in Windows?

If I have 2 broadband lines from 2 different ISP and these lines are connected to a single linux gateway. All my clients behide the linux box will uses these two lines to access the internet. Now I want to have a more statable internet connection for my clients such that if one of the...

Can anyone help?

Hi, How to sync. the tables in the databases with different location? For example, there are 1 head office and 2 branch offices and each has the same database structure in its local server. However the data in these databases should be sync. after office hour. i.e. A sync. operation/program...

I have a RH9 gateway and there are some user account on it. I have enabled the ssh tunel feature because I needed to remotely administer the internal machines. However I don't want the other users on the gateway using the tuneling feature. How can I disabled this feature in sshd for some...

Then, what's the directive?