Robots.txt file is a simple text file which is responsible for preventing crawling of your site’s pages. Suppose you have certain pages which are not SE friendly such as pages including repeated keywords, some hidden tags with keywords and some other bugs which may be responsible for getting your site banned from search engines.

The robots.txt file is a simple text file which can be created using Notepad.
It should be saved at root directory of your site. eg.http://www.yoursitename.com/robots.txt.

Format :
User-agent: robot or spider name
Disallow: files or directories.

If you want to exclude all the search engine spiders from your entire domain, Just use this tiny code, but be sure you need it.
User-agent: *
Disallow: /

If you want to prevent your certain directories, you can specify them in Disallow field.
User-agent: *
Disallow: /directoryname1/
Disallow: / directoryname2/

Similarly if you want to restrict specific files then type in the path of the files.
User-agent: *
Disallow: / directoryname1/filename.html

If you don’t want certain spiders crawling your site, which are not useful for you or are just eating up your bandwidth, you can specify them in User-agent. Eg. You don’t want bot of Alta vista (Scooter) from crawl your whole site use following code.
User-Agent: Scooter
Disallow: /

While using robots.txt file you should be careful, It may stop your specified pages from appearing in search engines.There are many hundreds of bots and spiders crawling the Internet, most of them respect your robot.txt file while some may not.

Note :

(*) You can include comments in your robots.txt file, by putting a pound-sign (#) at the front of the line to be commented.
(*) You can find the names of robots which are crawling around your site in your log file..

Sometimes we get some errors while using outlook express but we can’t understand what they mean and what could be the solution for that.

Following are the usual errors codes with their solutions ;

0×800CCC00 - Authentication did not load.
Solution :
*) Try closing and restarting Outlook express
*) If still getting same error, wait 20-30 minutes for a server reset of your account then try again.
*) It could be a corruption of the user account in Outlook Express. Try setting up a second identity and see if it works.

0×800CCC01 - INVALID CERTIFICATE CONTENT
0×800CCC02 INVALID CERTIFICATE DATE
Solution :
*) Get your certificate re-issued by your authority server.

0×800CCC03 - USER ALREADY CONNECTED
Solution :
*) Close all connections on all machines, wait 20-30 minutes and try again.
*) If you are not logged in on another machine or poplocked then someone may be using/downloading from your account or something is wrong with your account.
*) Sometimes due to improper disconnection your account gets ‘Poplocked’ so to get out of it either wait 20-30 minutes for it to time out or get somebody to shell into the mail server and stop the mail task that is running on the account.

0×800CCC05 NOT CONNECTED TO SERVER
0×800CCC0D CANT FIND HOST – Cannot locate server
Solution :
*) You may have typed wrong mail server in your account settings or the server may be down.
*) Reboot the computer and try again.
*) Data may not be moving across the network properly. Check DNS numbers, remove and then reinstall TCP/IP in Control Panel > Network.

0×800CCC0A MESSAGE DOWNLOAD INCOMPLETE
0×800CCC19 TIMEOUT
Solution :
*) This error may be due to corruption of pop3uidl file. Close the Internet connection and all programs. Search for the file ‘pop3uidl and delete it. Reconnect and it should work.

0×800CCC0F CONNECTION DROPPED
Solution :
*) may be modem or network cable was disconnected. If this happens frequently then try updating the modem drivers or adding an Init string.

0×800CCC10 INVALID ADDRESS – Address not known on server
Solution :
*) Check the spelling in the TO: field of the e-mail. Delete the old message from the Outbox and then try it again.

0×800CCC12 SOCKET READ ERROR – Unable to send Winsock request
Solution :
*) Remove the TCP/IP protocol and reinstall it. In windows, go into Network from the Control Panel. NOTE: You may need your Windows CD for this task!

0×800CCC16 INVALID ACCOUNT – User account not recognized
Solution :
*) Check the spelling of the account name and re-enter the password taking care to spell it correctly.

0×800CCC18 SICILY LOGON FAILED – Logon attempt failed
Solution :
*) Check account information, making sure account is not case sensitive, close Outlook Express, restart the computer and try reconnecting.
*) Create a different identity and see if it will logon on from this identity with the same information.
*) Make sure the account is still active with the ISP.

0×800CCC1A SECURE CONNECT FAILED – Unable to connect using SSL
Solution :
*) Your ISP may not require an SSL connection. Turn off SSL in the e-mail account properties and try again.