Computer Port list

What is Computer port ?

An interface on a computer to which you can connect a device. Personal computers have various types of ports. Internally, there are several ports for connecting disk drives, display screens, and keyboards.

Externally, personal computers have ports for connecting modems, printers, mice, and other peripheral devices.

Almost all personal computers come with a serial RS-232C port or RS-422 port for connecting a modem or mouse and a parallel port for connecting a printer.

On PCs, the parallel port is a Centronics interface that uses a 25-pin connector. SCSI (Small Computer System Interface) ports support higher transmission speeds than do conventional ports and enable you to attach up to seven devices to the same port.

In TCP/IP and UDP networks, an endpoint to a logical connection. The port number identifies what type of port it is.

For Network administrator must know about the computer Port, to identify network attack and network function purposed.

Below is a general computer port list and the service port name:

Service Name	Port Number
Windows Services
Browsing DHCP Lease DHCP Manager Directory Replication DNS Administration DNS Resolution Event Viewer File Sharing Logon Sequence NetLogon Pass Through Validation Performance Monitor PPTP Printing Registry Editor Server Manager Trusts User Manager WinNT Diagnostics WinNT Secure channel Wins Replication Wins Manager Wins Registration Direct Hosting of SMB over TCP/IP	UDP:137,138 UDP:67,68 TCP:135 UDP:138 TCP:139 TCP:135 UDP:53 TCP:139 TCP:139 UDP:137,138 TCP:139 UDP:138 UDP:137,138 TCP:139 TCP:139 TCP:1723 IP Protocol:47 (GRE) UDP:137,138 TCP:139 TCP:139 TCP:139 UDP:137,138 TCP:139 TCP:139 TCP:139 UDP:137,138 TCP:139 TCP:42 TCP:135 TCP:137 TCP,UDP:445

Service Name	Port Number
Windows Load balancing System (WLBS) & convoy for cluster Control
Convoy WLBS	UDP:1717 UDP:2504
Microsoft Exchange
Client/Server Comm. Exchange Administrator IMAP IMAP (SSL) LDAP LDAP (SSL) MTA – X.400 over TCP/IP POP3 POP3 (SSL) RPC SMTP NNTP NNTP (SSL)	TCP:135 TCP:135 TCP:143 TCP:993 TCP:389 TCP:636 TCP:102 TCP:110 TCP:995 TCP:135 TCP:25 TCP:119 TCP:563
Windows Terminal Services
RDP Client (Microsoft) ActiveX Client (TSAC) ICA Client (Citrix) Terminal Server IPSec ISAKMP ESP AH Karberos Karberos RSVP RSVP	TCP:3389 TCP:80,3389 TCP:1494 TCP:3389 UDP:500 IP Protocol 50 IP Protocol 51 TCP;UDP:88 IP Protocol:46

Callback connection setting

The callback feature instructs your remote access server to disconnect, and then to call you back, after you dial in.

What does it mean and what for ?
Call the server from your home, then immediately hanging up by the server and then server dialing you back.
Required callback enhances network security by ensuring that only users from specific locations can access the server. By dropping the call, and then calling back a moment later to the preassigned callback number, most impersonators can be thwarted.

How it work ?



You call the server to the server via modem, once your server modem response, your connection automatically disconnected then your server call you back.

What for ?
For example, you need some file from your network server while you are at home or you are out of office, and this is reduce your phone charge and the others one, you can used internet trough your server network as a gateway.

How to Setting ?

Office/Server Setting:
step 1: Incoming Connection

Open Network Connection -> Create a new connection -> Next -> Select Set up an Advance Connection -> Next -> Accept incoming connection -> Select your modem device -> Do not allow virtual private connection -> select User Permission -> Next -> Finish.

step 2:
Set Remote Access Server (RAS)
Of course this part must configured by your administrator (if you want to know how to configure RAS, ask me). If you are as a user, put the modem to your computer as your network client, then do the only step1, and of course you have to let your computer on when you leave.

Your Home Computer setting:
step 1:

Open Network Connection -> Create a new connection -> Next -> Connect to the Internet -> Next -> Setup my connection manually -> Connect using a dial-up modem -> Type connection name -> Next -> Type the Phone Number -> Type User Name and password that you has been permission to connect as above (server configuration) -> Next -> Finish.

step 2:
Open Network Connections.
On the Advanced menu, click Dial-up Preferences.
On the Callback tab, do one of the following:
1. If you do not want to use callback, click No callback.

2. If you want to decide whether to use callback at the time you connect, click Ask me during dialing when the server offers.

3.If you want to use callback consistently, click Always call me back at the number(s) below, and select the modem or device on which you want to be called back.

4.If Phone number is blank for the device you have selected, click Edit, and then type the number.

5.If you want to remove a modem or device from the list of possible callback devices, click the modem or device, and then click Delete.

(see the final setting screen)


Now try connect to your computer office.
The surprised is,
1. The phone cost become to your office computer phone line. Your cost only on the first called.
2. If your office computer able to connect the internet via you server connection, you can used internet too from your home (must check your office computer firewall setting).

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This site started on Wednesday, May 2, 2007, This site is talking about the Computer Technology, networking, gadgets and others regarding to Technology information. (author: Jan Pieter Marbun)

This site is my experience as an IT worker at manufactured company. I dedicated this site to my friends, my staff and reader's who loved the Information Technology jobs.

Thanks to my visitor and my readers for stopped by this site, please do leave comment when you visit this site and i Appreciate for your review.

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How to remove content advisory password

If your computer got password to surf the internet, you can try this to removed the content advisory password on your browser.

1. Click on Start and choose Run.

2. Type in RegEdit and select OK.

3. Now click on the little plus sign to the left of H_KEY_LOCAL_MACHINE.

4. Continue to drill down, always clicking on the plus sign at the left of the named key, through Software, Microsoft, Windows, Current Version and Policies.

5. Now click on the Ratings folder.

6. In the right pane of the RegEdit window, you'll see an icon called Key. Click on it and press Delete.

7. Next, choose Registry and then Exit to exit RegEdit. You've just deleted your original Content Advisory password.

8. Restart the computer and run Internet Explorer again.

9. Choose View and then Internet Options (or Options for version 3.x). For IE 5 or greater, Click on Tools, Internet Options.

10. Click on the Content tab and click on Disable. When asked for a password, don't enter anything; just click on OK. This will disable Content Advisor because there's no longer a password.


How to fix Problems with Content Advisor Missing Information
In most cases, this problem occurs when the Ratings.pol file is damaged, follow the instructions below to fix this issue:

1. Quit Internet Explorer

2. Open My Computer, click on Tools, Folder Options

3. Click on the View tab and make sure "Show hidden files and folders" is selected, you may also want to uncheck the box next to "Hide extensions for known file types" and click Ok

4. Double click on Drive C in My Computer

5. Double click on the Windows folder and then double click on the System folder

6. Search for the file RATINGS.POL and right click on it and choose Rename. Rename it to RATINGS.OLD

7. Close out of the open Windows and then reopen Internet Explorer

8. Click on Tools, Internet Options

9. Click on the Content tab, then click on Settings

10 Type in the Supervisor password if necessary and click Ok

11. Select the Ratings options you would like and click Ok and close out of Internet Explorer

12. When you reopen Internet Explorer, everything should work.

SMTP Investigation for Telkom adsl connection

Investigate SMTP Connection for TELKOM ADSL :

Below is a FAQ to investigate SMTP Relay, smtp.telkom.net. Follow this step to do smtp investigation:

1. Run test nslookup to the smtp telkom server :

IP not found from smtp.telkom.net?, check your DNS number, don’t know your DNS number ? You can asked what’s the DNS number for your telkom connection to astinet customer service (147).

2. Run ping to smtp server :



When your ping results is RTO (Request Time Out), that’s means your computer/network is unconnected with telkom server. You have to checked your adsl connection or adsl modem indicator. ADSL indicator lamps is blink that’s mean no adsl signal to your modem or cannot login.

3. Tracert into smtp server :


Tracert result display is indicated server found.


4. Test send email via telnet :



Sending email via telnet, used for tested into smtp telkom.net server. Do this test if sending mail via Outlook express failed.

Above picture is a Linux testing result, for the process step you can do via cmd (command prompt) windows, but the words that you type is disappear.

If you see the above picture result, that’s means sending email via telnet is successful, but send mail using Outlook Express almost failed, Had to checked your Outlook express software.

If all step had been done, but cannot send mail, check from your server side :

1. Are your server using Firewall ?
2. Check your ADSL configuration, do not block smtp (25 port)
3. Do you have anothers application problem with your server ?, example : wingate ?

Note for wingate had special configuration for SMTP mail server, check your wingate configuration.


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