trigger - SQL Server 2008 - Msg 7391 - "no transaction is active/unable to begin trans"

I have a trigger on my SQL Server, located in server7. It inserts a data on another server (server5), after insert, as you see the code below: CREATETRIGGER [dbo].[trgSPTInsereDepartamento] ON [dbo].[tblDepartamento] AFTER INSERT AS BEGIN SET NOCOUNT ON; insert into [Server5].alfabase.dbo.tblDepartamento (CodDepto,DescDepto,IncluiOutroDepto) Select ins.codDepartamento, ins.DescDepartamento, 0 From inserted ins where not exists(select 1 from [Server5].alfabase.dbo.tblDepartamento sptsta where sptsta.CodDepto = ins.CodDepartamento) END When i make an insert, the SQL shows me this: > OLE DB provider "SQLNCLI10" for linked server "server5" > returned message "No transaction is active.". > Msg 7391, Level 16, > State 2, Procedure trgSPTInsereDepartamento, Line 7 The operation > could not be performed because OLE DB provider "SQLNCLI10" for linked > server "server5" was unable to begin a distributed > transaction. Local DTC properties is all checked ( it allows remote users ). I've restarded the server and the DTC service. No Luck for me. I read a lot of posts but none of them helped me. Thanks for the help. > **update1:** Checked firewall. disabled it but still doesn't work. DTC is ok ( only server5 is on a cluster. ) I'm really out of ideas guys. Thank you very much. > **Update 2**: From server7 to server5, I have the problem above. To test, I made a trigger on a database from server4 to server5. and it worked. So, the problem is on server7. Server7 is not on the Cluster (server3,4,5 are clustered).