Connect to SSIS on clustered sql2k5

I got following error when try to expand msdb under SSIS in SSMS, the SSIS I connected to is on clustered server. The windows account used is member of local admin on both nodes in the cluster and sysadmin in sql. I tried with host name that SSIS runs on and virtual sql server name for connection, tried connect from remote client machine and server itself, got same error:

Failed to retrieve data for this request. (Microsoft.SqlServer.SmoEnum)

Login timeout expired
An error has occurred while establishing a connection to the server. When connecting to SQL Server 2005, this failure may be caused by the fact that under the default settings SQL Server does not allow remote connections.
Named Pipes Provider: Could not open a connection to SQL Server [2]. (Microsoft SQL Native Client)

Login timeout expired
An error has occurred while establishing a connection to the server. When connecting to SQL Server 2005, this failure may be caused by the fact that under the default settings SQL Server does not allow remote connections.
Named Pipes Provider: Could not open a connection to SQL Server [2]. (Microsoft SQL Native Client)

Anyone knows what's happen? Thanks.

I solve the problem by changing <ServerName>.</ServerName> to <ServerName>virtual_sql_server_name</ServerName> in %ms sql server%\90\dts\binn\MsDtsSrvr.ini.xml file on each node.|||

I have configured SSIS on the cluster after clustered DB installation. I have followed the directions on 'How to: Configure Integration Services on a Cluster' doc on msdn (http://msdn2.microsoft.com/en-us/library/ms345193.aspx) but I am still not able to connect and I get this error message (very similar to the message on beginning of this post)

TITLE: Microsoft SQL Server Management Studio

Failed to retrieve data for this request. (Microsoft.SqlServer.SmoEnum)

For help, click: http://go.microsoft.com/fwlink?ProdName=Microsoft+SQL+Server&LinkId=20476

ADDITIONAL INFORMATION:

The SQL server specified in SSIS service configuration is not present or is not available. This might occur when there is no default instance of SQL Server on the computer. For more information, see the topic "Configuring the Integration Services Service" in Server 2005 Books Online.

Login timeout expired
An error has occurred while establishing a connection to the server. When connecting to SQL Server 2005, this failure may be caused by the fact that under the default settings SQL Server does not allow remote connections.
Named Pipes Provider: Could not open a connection to SQL Server [2]. (MsDtsSrvr)

BUTTONS:

OK

Appreciate any help you can provide.

Thanks!