The underlying provider failed on Commit.

Question

Hello,
I am having a problem with commit.
Here is the code where program stuck.
using (var transaction = DataEngine.Context.Database.BeginTransaction(IsolationLevel.ReadCommitted))
try
var createResult = DataEngine.Context.Customer_Modify(BusinessID, cutomerName,usermodified);
Logger.LogTrace(createResult.ToString());
await DataEngine.Context.SaveChangesAsync();
transaction.Commit();
catch (Exception ex)
Logger.LogTrace(ex.Message);
// Attempt a rollback
try
transaction.Rollback();
catch (Exception nex)
Logger.LogTrace(nex.Message);
throw;
throw;
After running the above code, I check the variable query and found an exception
The underlying provider failed on Open.
I've checked:
Connection between server and computer is normal
I can login to the database with username and password 
I have checked the security settings in database (SQL Server) that permission has been granted .
I can able to 'Insert' records but not 'Update'
Why does this exception happen? I'm using .net 4.5
Thanks

Answer 1

Hi SamKri,
You could try to enabling "Allow Remote Clients" in DTC config.
You could open the DTC config by running dcomcnfg, Component Services -> Computers -> My Computer -> Distributed Transaction Coordinator -> Right click to  Local DTC -> Security.
If this is still not working, the issue may be caused by the connectionString, you could share the connectionString with us, we could help you better.
Regards,
Youjun Tang
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