How do I enable MSDTC on SQL Server

Question

Is this even a valid question  I have a  NET Windows app that is using MSTDC and it is throwing an exception      System Transactions TransactionManagerCommunicationException  Network access for Distributed Transaction Manager  MSDTC  has been disabled  Please enable DTC for   network access in the security configuration for MSDTC using the Component Services Administrative tool ---  System Runtime InteropServices COMException  0x8004D024   The transaction manager has disabled its support for remote network   transactions   Exception from HRESULT  0x8004D024  at System Transactions Oletx IDtcProxyShimFactory ReceiveTransaction UInt32   propgationTokenSize  Byte   propgationToken  IntPtr managedIdentifier    Guid amp  transactionIdentifier  OletxTransactionIsolationLevel amp    isolationLevel  ITransactionShim amp  transactionShim        I followed the Kbalertz guide to enable MSDTC on the PC on which the app is installed  but the error still occurs    I was wondering if this was a database issue  If so  how can I resolve it

User · Answer

Do you even need MSDTC  The escalation you re experiencing is often caused by creating multiple connections within a single TransactionScope   If you do need it then you need to enable it as outlined in the error message  On XP    Go to Administrative Tools -  Component Services Expand Component Services -  Computers -   Right-click -  Properties -  MSDTC tab Hit the Security Configuration button

User · Answer

I ve found that the best way to debug is to use the microsoft tool called DTCPing   Copy the file to both the server  DB  and the client  Application server client pc    Start it at the server and the client At the server  fill in the client netbios computer name and try to setup a DTC connection Restart both applications  At the client  fill in the server netbios computer name and try to setup a DTC connection    I ve had my fare deal of problems in our old company network  and I ve got a few tips    if you get the error message  Gethostbyname failed  it means the computer can not find the other computer by its netbios name  The server could for instance resolve and ping the client  but that works on a DNS level  Not on a netbios lookup level  Using WINS servers or changing the LMHOST  dirty  will solve this problem  if you get an error  Acces Denied   the security settings don t match  You should compare the security tab for the msdtc and get the server and client to match  One other thing to look at is the RestrictRemoteClients value  Depending on your OS version and more importantly the Service Pack  this value can be different  Other connection problems    The firewall between the server and the client must allow communication over port 135  And more importantly the connection can be initiated from both sites  I had a lot of problems with the firewall people in my company because they assumed only the server would open an connection on to that port  The protocol returns a random port to connect to for the real transaction communication  Firewall people don t like that  they like to restrict the ports to a certain range  You can restrict the RPC dynamic port generation to a certain range using the keys as described in How to configure RPC dynamic port allocation to work with firewalls     In my experience  if the DTCPing is able to setup a DTC connection initiated from the client and initiated from the server  your transactions are not the problem any more

User · Answer

MSDTC must be enabled on both systems  both server and client   Also  make sure that there isn t a firewall between the systems that blocks RPC  DTCTest is a nice litt app that helps you to troubleshoot any other problems

User · Answer

Dan      Do I not need msdtc enabled for   transactions to work    Only distributed transactions - Those that involve more than a single connection  Make doubly sure you are only opening a single connection within the transaction and it won t escalate - Performance will be much better too

User · Answer

Can also see here on how to turn on MSDTC from the Control Panel s services msc      On the server where the trigger resides  you need to turn the MSDTC   service on   You can this by clicking START   SETTINGS   CONTROL PANEL   ADMINISTRATIVE TOOLS   SERVICES   Find the service called  Distributed Transaction Coordinator  and RIGHT CLICK  on it and   select    Start

User · Answer

Use this for windows Server 2008 r2 and Windows Server 2012 R2   Click Start  click Run  type dcomcnfg and then click OK to open Component Services  In the console tree  click to expand Component Services  click to expand Computers  click to expand My Computer  click to expand Distributed Transaction Coordinator and then click Local DTC  Right click Local DTC and click Properties to display the Local DTC Properties dialog box  Click the Security tab  Check mark  Network DTC Access  checkbox  Finally check mark  Allow Inbound  and  Allow Outbound  checkboxes  Click Apply  OK  A message will pop up about restarting the service  Click OK and That s all    Reference   https   msdn microsoft com en-us library dd327979 aspx  Note  Sometimes the network firewall on the Local Computer or the Server could interrupt your connection so make sure you create rules to   Allow Inbound  and  Allow Outbound  connection for C  Windows System32 msdtc exe

[sql-server] How do I enable MSDTC on SQL Server?

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