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Archive for Server Security

Online File Storage and Backup Services

Online backup and file storage services are becoming more popular these days. Both business and home users are seeing its importance. It can be a life saver if you become a victim of arson, theft, flooding, a power surge etc.; the local data backup procedures are useless in such cases. The best way of keeping the data secure is by keeping a copy of the data “offsite”. Some users do this by leaving a copy of data in a bank or at a  friends house. The best method in this regards is by keeping online backups which also ensures you complete peace of mind.

While searching for an online data backup service, it’s better to understand a few points.

How safe is online backup service?
- Many users are not sure of putting their data online, after all it’s vital information that they are going to access from any computer. But this doesn’t mean that data is accessed by everybody. The threat to loose data in online backups is very low as long as you are taking this service from the reputable provider.

How easy are online backup services to use?
-Only the files that you upload are saved by online backup services. You are able to access your data online from anywhere in the world. Also remember that this is not the only form of data backup. There are also other ways but online service is best in case of data security.

How fast are they?
- For using online backup services it is always required to use high speed internet connection. The dial up connection will not do in this case. By using high speed internet connection you just need to login into the account and upload your content.

How much space is offered?
-This will depend on the backup service provider you choose. Most of them offer 1GB of space to get you started. But it all depends on the provider you choose.

If you are looking for trusted and reliable backup service provider then eUKhost is the best in this solution, Check out the backup services offered by them-
http://www.eukhost.com/backup.php

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My IP address is blacklisted. How can it be unlisted?

If your web site hosting server’s IP address is blacklisted in an anti-spam database, any e-mail you send will be bounced back. You will receive a mail in the following format:This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address (es) failed:

sales@eukhost.com
SMTP error from remote mailer after RCPT TO:
eukhost.com [205.234.198.2]: 550-Message rejected because eukhost.com [205.234.198.2] is blacklisted at
550 bl.spamcop.net see Blocked - see http://www.spamcop.net/bl.shtml? 205.234.198.2

In this case please send a support ticket to support/technical department

Or else you can follow the steps below:

1. Go to www.spamcop.net.
2. Input your server IP address (ex. 205.234.198.2) and click on “Lookup Another”.
3. If the IP address is not listed, that means the IP address has already been removed from the database. You need to allow 24 hours for this to reflect globally.
4. If the IP address is listed, in order to get the IP removed please follow these steps:

a) Go to ORDB.org
b) From the left hand side menu click on “Test an open relay”
c) Input server’s IP address as “Hosts/IPs”
d) input emails@eukhost.com as e-mail.
e) Click on “Submit Hosts for testing”

Allow up to 48 hours and the IP will be removed automatically.

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Enable/Disable register_globals

The most common setting that clients will want to change are the “register_globals” settings. If you want to enable register_globals, you will need to create a .htaccess file in your site’s main directory (or the main directory of your site that contains PHP hosting scripts). Your .htaccess file should contain the following line: php_flag register_globals on

If you want to disable register_globals then your .htaccess file should contain the following line:

php_flag register_globals off

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IP Address Spoofing

IP Spoofing is a technique which is used to gain unauthorized access to computers, whereby the squatter sends messages to a computer with a false IP address to indicate that the message is coming from a trusted host. In other words it is a process of returning IP address that is different from the one that is actually assigned to the destination website.

To involve in IP spoofing, the intruders use a variety of techniques to find an IP address of a trusted host and then modify the packet headers so that it appears that the packets are coming from that trusted host.

In case IP spoofing is used to hijack a browser, whenever any visitor types in a legitimate site’s URL, he is taken to a fraudulent Web page of the intruder. For example if the intruder has spoofed a popular ecommerce website, then any Internet user who would type in the URL of that particular site would be redirected to the spoofed content created by the intruder.

If a user interacts with dynamic content on that spoofed page, the intruder can gain access to sensitive information on the particular computer or network such as a credit card number or password, or install malware.

IP Spoofing is a big no no when in terms of SEO as it is considered a black hat seo technique. Newer routers and firewall arrangements can help protect your network from these malicious cloaking and cracking techniques.such as IP spoofing.

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Changing MX-entries.

You can use the Modify Mail Exchanger (MX Entry) function to change where a domain’s email is delivered to. This allows you to have the email from one domain delivered to another domain. Just follow these simple steps :

1 To access the Mail Menu, click on the icon above the word Mail on the main screen of your cPanel interface.

2 Click on Modify Mail Exchanger (MX Entry).

3 The current MX entries will be listed on this screen. Click on Change an MX Entry to modify one of those entries.

4 Select the domain you wish to change the entry for from the drop box.

5 Enter the new destination domain in the blank field and click Change.

NOTE: If the entry was changed successfully, the following will appear (except the domains listed will be the ones you are using):

MX Entry Saved

The MX entry for domain.com has been changed to domain2.com

The local mail configuration has been updated!

Important ::: You will need to make the MX entry point to a domain that you are in control of so you can get the mail once it is sent to that domain. Invalid domain names will not work.

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Tar command

Tar files creation command :

tar -cvf mystuff.tar mystuff/
tar -czvf mystuff.tgz mystuff/

extracting:

tar -xvf mystuff.tar
tar -xzvf mystuff.tgz
testing/viewing:

tar -tvf mystuff.tar
tar -tzvf mystuff.tgz

Note : .tgz is the same thing as .tar.gz

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