Category: Msdtc troubleshooting

Msdtc troubleshooting

Skip to main content. By using the DTCPing tool, you can test the name resolution between two computers. You can also test the remote procedure call RPC communication between two computers. More Information. Download information The following file is available for download from the Microsoft Download Center: Download the Dtcping.

For more information about how to download Microsoft support files, click the following article number to view the article in the Microsoft Knowledge Base: How to obtain Microsoft support files from online services.

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MSDTC Troubleshooting – Basic Guide Part 2

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Troubleshooting MSDTC Communication Checklist

India - English. Indonesia Bahasa - Bahasa. Ireland - English. Italia - Italiano. Malaysia - English. Nederland - Nederlands.There are some documents discussed above scenarios from different views, but some of them are out of date now or some words are not properly for production environments.

Open Services. Ensure the name resolution of machine names between each machine works. The screenshot is like below, the "Incoming Remote Transactions" and "Outgoing Remote Transactions" must be installed:. For a server, the dynamic port range should be at least above It should be similar to this:.

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If the DTC server is a cluster, after changed the UI for port range, please make sure the Registry key does match the values, otherwise, please manually change them:. If the client process doesn't have enough permission to query the MSDTC service status, the "Transaction Manager is not available" error will also happen. I resolved several problems with below steps:. Now next article we will focus on Firewall and Dynamic port allocation in DTC troubleshooting scenario. Skip to main content.

Exit focus mode. We generally have three typical things to verify, including: 1. MSDTC installation or configuration incorrectly on both sides. MSDTC fully depends on RPC communication, whether RPC dynamic port can be opened without issues There are some documents discussed above scenarios from different views, but some of them are out of date now or some words are not properly for production environments.

msdtc troubleshooting

If you setup dynamic Port range for RPC communication, please pay attention to: a. The dynamic port range change will not take effect before machine reboots. Related Articles In this article.Recently we received complaints from the Information System team that there was slowness in a specific page of our web site. We looked at SQL Server and checked the MS DTC transactions, a few transactions we found were opened for a long time, but we were unable to identify which system was issuing these transactions and which of these transactions was causing the slowness issue.

In this way, DTC will guarantee that the distributed transaction will succeed as one component if all the transaction parts complete successfully or rolled back as one component if any part of the transaction fails. SQL Server distributed transactions that connect to one or more remote databases can be monitored using the MS DTC console, from where you can find a list of all distributed transactions that are currently running on SQL Server. But as a DBA, in order to trace a transaction that is running for a long time or a transaction that is causing an issue, we need the details about these transactions in order to provide information to the related system owner.

The only available information in this page is the distributed transaction status and the Unit of Work ID for that transaction. This information is not enough to trace the transaction that is causing an issue in the system. What is missing is a way to map this information back to SQL Server in order to get the transaction details. To achieve this, the sys. Joining that DMV with the sys. The result will be like this:. As you can see, with one query you can get information about all of the currently running distributed transactions, such as the database name, login name, host name, query status, query text, wait type and how many resources are being consumed by the query.

And now, the incomprehensible data displayed in the MS DTC console can be translated to information we can use in our investigation and performance tuning process. Post a comment or let the author know this tip helped.

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msdtc troubleshooting

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Email me updates. Recommended Reading. How to tell what SQL Server version you are running. Resolving could not open a connection to SQL Server errors. Setting a fixed amount of memory for SQL Server.Here I cover other tricks that can ruin your day. This is the outcome of that frustration — a guide that you may find helpful and prevent the stress I experienced. So without further ado…. In my experience situations like this mean it is usually necessary to uninstall and reinstall the MSDTC service on the machines in the distributed transaction.

On some occasions you may discover that ports necessary for MSDTC were closed off by the firewall and need to be corrected there. This can occur when using virtual hard disks to deploy an operating system to a virtual machine.

msdtc troubleshooting

It may throw an error like this:. In this case some necessary registry values may be missing. If there are missing values then recreate them, set to the default value it is in [brackets]and run:. The Distributed Transaction role might need to be re-installed. In this case add the role for Distributed Transactions and check these boxes:.

MSDTC Troubleshooting – Basic Guide

This is a bigger subject that I once thought. May you have better luck that I did! Email Address. Sign me up!

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Verify that reverse name lookup of the IP address associated with the NetBIOS name on each computer resolves to the correct computer name. Yes I want to Subscribe! Just take my money Share this: Tweet.

Like this: Like Loading Leave a Comment Cancel reply. Sorry, your blog cannot share posts by email.What comes next is my contribution to those who follow into the dark denizens of MSDTC hoping to fix things so they can go home. Much of what is written below can be directly applied to this situation.

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The most basic function it performs is to keep transactions ACID. The most popular implementation of this is 2 phase commit. The transaction manager makes sure all is well and compliant with ACID for the transaction to commit and then allows it to commit. It is a transaction manager that allows applications to include several different sources of data in one transaction.

MSDTC coordinates committing the distributed transaction across all servers enlisted in the transaction. An example here would be a process on one machine calling a stored procedure on another machine which in requires data that changes together in a transaction. The MSDTC service is running on each of the servers to manage the successful commit or rollback of the transaction across all servers enlisted in the transaction.

If distributed transactions are being used with SQL Server then it is required that MSDTC be installed and used for distributed queries, two-phase commit transactions, and some replication functionality. Here is another example to show how it integrates with an Application Server forming a distributed transaction with SQL Server:.

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It looks like this and it should appear on every machine which will participate in a distributed transaction. It must work bi-directional from each host to the other.

When making changes to the registry it is a good practice to first take a backup of the registry! Remember that it needs to be installed, configured, and running on each host that contains a SQL instance for our products.

The above query tested a remote query. This is possible because a linked server has been setup to connect to the remote SQL Instance. There are a few things we should confirm about the linked server connection:. NOTE: Open this via command prompt using admin privileges! Do not try to access via file explorer.

The logs are in binary and are not viewable by a text editor such as notepad. Now that some of the basics have been covered we are ready to discuss some more common and specific failures which are apt to occur. See part 2 here! Like what you are reading? Please subscribe! Email Address.On an application layer like SQLthese are the common error messages that will be bubbled up.

If you encounter one of the above error messages while using Distributed Transactions from your application, feel free to use the DTCPING tool to find out where the problem lies. This blog explains how to use the DTCPing tool to narrow down the source of the problem and how to fix it. Before talking about the various errors that are thrown by this tool, it is very important to understand the right way to run the tool properly so that we can get the right output from the tool.

If everything works fine you should see the following message being returned by the tool. If you see the above message, go to the second server and put the name of the source server in the Remote Server Name field and hit PING and make sure that you see the same results as above.

If the result of the tool is not success, figure out what error you are getting and follow the steps mentioned in the sections below to fix the error message. Can not resolve abc Invalid remote host name:abc. I think this error is more than self explanatory. You will get this if the host name that you added in the Remote Server Name is not a valid host name.

If that host name is not resolving to any IP address, you can try adding the host name in the hosts file and try running the tool again. RPC test failed. This indicates that either the port or one of the ports in the DCOM port range is blocked on the firewall.

On a Windows Server, the telnet service is not installed by default and you have to install it by configuring the role services on the server.

msdtc troubleshooting

If you see a blank window with a cursor blinking, that is enough to tell that the port is NOT blocked but if the telnet command fails with an error, you can easily infer that the port is blocked and you should check with your network team to get the port opened up bi-directionally on the firewall. EXE is listening. If you got this error, then this test has to fail. Should I got ahead and open up the entire range on my firewall? Then what is use of a firewall?

The answer to that is - you don't have to open up this entire range on the firewall but you can restrict the RPC End Point Mapper Service to just specify a range of ports that will be used by any DCOM program. This error is a result of a firewall disconnecting the TCP connection between the two machines. You have to get in touch with your firewall administrators to help you figure out why the Firewall is closing the TCP connection between two machines.In this case, a transaction means a general way of structuring the interactions between autonomous agents in a distributed system.

However, in my simple definition, it is a service from Microsoft that you need to deal with whenever you want to do transaction processing, and it is very hard to identify and troubleshoot any of the problems that you may face while interacting with it. Doing transaction processing in your code is a very simple to do task, all that it needs to surround the part that you want to be executed as one transaction with one Transaction scope and commit it whenever you finish all parts.

But with the default setup on your machine, most likely you will end up with the below common MSDTC error:. When you connect to another server or DB server, that server needs to enable Distributed Transaction for network access on it as well. If you are trying to connect to another server, and you are getting an error simillar to the below, this means that its time to start cross machines investigation. MSDTC uses port to connect to other servers; a simple telnet command on port should help you identify the problem, the command should be executed from both machines, as the port should be opened for both directions.

In the below example, let's imagine that your server IP address is " You need to make sure that both machines see each other using the same IP address, this problem usually occurs due to some domain configuration where they disable IP Address resolving within the network.

In order to identify this problem, you need to compare the results from running " IPconfig " command on machine A and a ping to the same Machine. The output IP address should be matching. In order to exactly figure out what is happening, you need to track where your transaction is stuck at, the below methods can help you in this process:.

If you are using SQL server, it is very easy to identify if the transaction has reach the database side or not. To do so, the below SQL command needs to be executed:. This screen also give the option to " Commit ", " Abort " and " Forget " this transaction. DTCPing is very helpfull tool which can be downloaded directly from Microsoft website, this tool can assist you trhough debugging and diagnosing DTC issues, as it can simulate a DTC between two machines.


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