ERROR: "Verify the server and instance names and check that no firewall is blocking UDP traffic to port 1434. For SQL Server 2005 or later, verify that the SQL Server Browser Service
![Exception thrown by ... Failed to authenticate: ADM ... Verify the server and instance names and check that no firewall is blocking UDP traffic to port 1434" when launching Controller Web Exception thrown by ... Failed to authenticate: ADM ... Verify the server and instance names and check that no firewall is blocking UDP traffic to port 1434" when launching Controller Web](https://www.ibm.com/support/pages/system/files/support/swg/cogtech.nsf/0/dc0b07f4cf017a47852580ae0026ed44/Cause/0.314.gif)
Exception thrown by ... Failed to authenticate: ADM ... Verify the server and instance names and check that no firewall is blocking UDP traffic to port 1434" when launching Controller Web
![Which firewall ports to open to allow browsing of instance names and connections to SQL Server 2008 R2 | oasysadmin Which firewall ports to open to allow browsing of instance names and connections to SQL Server 2008 R2 | oasysadmin](https://oasysadmin.files.wordpress.com/2012/07/createport.jpg?w=640)