Difference between TCP 1433 and UDP port 1434


hello is essential to enable the upd also in sqlserver 1434
and which is enabled as far i see i've never needed upd enable port 1434

to communicate sql server browser service on server behind firewall, open udp port 1434 !

content copied books online : 

network administrator should configure firewall forward communication sql server ip address , tcp port instance of database engine listening on (either tcp port 1433 default instance, or tcp port configured named instance). also, because microsoft sql server uses udp port 1434 establish communications links applications, have network administrator configure firewall forward requests udp port 1434 on same ip address. more information udp port 1434, see sql server browser service.

example, consider computer running 1 default instance , 2 named instances of sql server database engine. computer configured such network addresses 3 instances listen on have same ip address. default instance listen on tcp port 1433, while other named instances listen on tcp ports 1434 , 1954, respectively. network administrator configure firewall forward network requests udp port 1434 , tcp ports 1433, 1434, , 1954 on ip address.


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thanks,suhas vallala



SQL Server  >  Getting started with SQL Server



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