Solved

portno 1434

Posted on 2012-04-03
2
253 Views
Last Modified: 2012-08-23
Hi

what is the use of Portno 1434 in sqlserver? please explain the importance of this port. its been asked by so many peopel in the interview.

Thx
Naren
0
Comment
Question by:knaren1975
2 Comments
 
LVL 9

Expert Comment

by:rajeevnandanmishra
ID: 37800107
It is the TCP/IP Port on which the sql server will be listening for client requests by default.

And it is changed to another port in many scenarios, so that an alien could not connect to sql server.
0
 
LVL 5

Accepted Solution

by:
hafeezmca earned 500 total points
ID: 37800179
Hi,

Here is a copy of article from MSDN  about the TCP/IP port for Sql server:


Many companies use a firewall system to isolate their networks from unauthorized access from the Internet. A firewall can be used to restrict access to your network by forwarding only requests targeted at specific TCP/IP addresses in the local network. Requests for all other network addresses are blocked by the firewall. You can allow Internet applications to access an instance of the SQL Server Database Engine in the local network by configuring the firewall to forward network requests that specify the network address of the instance of the Database Engine.
 
To work with a firewall, the instance of the Database Engine must listen on the network address that the firewall is configured to forward. A TCP/IP network address for SQL Server Database Engine consists of two parts: an IP address associated with one or more network cards in a computer, and a TCP port address specific to an instance of SQL Server. Default instances of the Database Engine use TCP port 1433 by default. Named instances, however, dynamically assign an unused TCP port number the first time the instance is started. The named instance can also dynamically change its TCP port address on a later startup if the original TCP port number is being used by another application. SQL Server only dynamically changes to an unused TCP port if the port it is currently listening on was itself dynamically selected; if a statically assigned port is in use by another application, SQL Server displays an error and continues to listen on other ports. It is unlikely, however, that another application would use 1433 since that port is a well-known registered address for the SQL Server Database Engine.
 
When using a named instance of Database Engine with a firewall, use SQL Server Configuration Manager to configure the named instance to listen on a specific TCP port. You must pick a TCP port that is not used by another application running on the same computer or cluster. For a list of well-known ports registered for use by various applications, go to the Internet Assigned Numbers Authority Web site at http://www.iana.org.
 
The network administrator should configure the firewall to forward communication to SQL Server for the IP address and TCP port that the instance of the Database Engine is listening on (either TCP port 1433 for a default instance, or the TCP port you configured for a named instance). Also, because Microsoft SQL Server uses UDP port 1434 to establish communications links from applications, have the network administrator configure the firewall to forward requests for UDP port 1434 on the same IP address. For more information about UDP port 1434, see SQL Server Browser Service.

You can go through the complete article over here:

http://msdn.microsoft.com/en-us/library/ms175483.aspx
0

Featured Post

Efficient way to get backups off site to Azure

This user guide provides instructions on how to deploy and configure both a StoneFly Scale Out NAS Enterprise Cloud Drive virtual machine and Veeam Cloud Connect in the Microsoft Azure Cloud.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Slowly Changing Dimension Transformation component in data task flow is very useful for us to manage and control how data changes in SSIS.
The Delta outage: 650 cancelled flights, more than 1200 delayed flights, thousands of frustrated customers, tens of millions of dollars in damages – plus untold reputational damage to one of the world’s most trusted airlines. All due to a catastroph…
Familiarize people with the process of utilizing SQL Server functions from within Microsoft Access. Microsoft Access is a very powerful client/server development tool. One of the SQL Server objects that you can interact with from within Microsoft Ac…
Viewers will learn how to use the UPDATE and DELETE statements to change or remove existing data from their tables. Make a table: Update a specific column given a specific row using the UPDATE statement: Remove a set of values using the DELETE s…

813 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

17 Experts available now in Live!

Get 1:1 Help Now