I'm observing a problem where the DTC bails after ~600s, create a console application and run this against SQL2000...

using System;

using System.Collections.Generic;

using System.Text;

using System.Transactions;

using System.Data.SqlClient;

namespace ConsoleApplicationTXtimeout

class Program

static void Main(string[] args)

TransactionOptions transactionOptions = new TransactionOptions();

transactionOptions.IsolationLevel = IsolationLevel.ReadCommitted;

//transactionOptions.Timeout = new TimeSpan(0,0,0,30);

transactionOptions.Timeout = new TimeSpan(0);

DateTime started = DateTime.Now;

using (TransactionScope transactionScope = new TransactionScope(TransactionScopeOption.Required,transactionOptions))

while (DateTime.Now - started < new TimeSpan(0, 10, 0))

using (SqlConnection connection = new SqlConnection("Data Source=MyServer;Initial Catalog=MyDatabase;Integrated Security=SSPI"))

SqlCommand command = new SqlCommand("Update MyTable set MyField = MyField", connection);

Console.WriteLine(DateTime.Now);

System.Threading.Thread.Sleep(65000);

} // end connection

} // do 10 mins worth

Console.WriteLine(DateTime.Now);

} // end Tx

Console.ReadLine();

You are hitting the MaximumTimeout - see my previous post at http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=759488&SiteID=1