Hi Mrs, I´m trying to make a Transaction with 2 SQL Servers between ISA Server The scenario is: _____ ______ ______ | | TCP 1433-> | | TCP 1433-> | | | | <-TCP 1433 | | <-TCP 1433 | | | SQL |________________| ISA |_______________| SQL | | WAN | RPC 135 -> | | RPC 135 -> | LAN | |_____| <-RPC 135 |______| <-RPC 135 |______| ISA RULES: Server Publish: SQL LAN - TCP: 1433 Server Publish: SQL LAN - Any RPC Protocol Rules: SQL LAN - ALL IP TRAFFIC OUTBOUND The linked server between SQL LAN and WAN are working propperly. I can to execute remote select statement with either servers. But when I try to run a Begin Transaction, I get the following error: http://support.microsoft.com/default.aspx?scid=kb;en-us;839279 But, this article don´t apply on this case. TKS Alex