MSDTC on server 'server is unavailable'

In my case, the service was stopped. solution: need to turn the MSDTC service on

1. go to Services. (START > SETTINGS > CONTROL PANEL > ADMINISTRATIVE TOOLS > SERVICES)
2. Find the service called 'Distributed Transaction Coordinator' andRIGHT CLICK (on it and select) > Start.
3. make this service to run Automatically for solving this issue permanently

Triggers are included in the implicit transaction required for insert, update, and delete statements. Because you are connecting to a linked server within a transaction, SQL Server promotes it to a Distributed Transaction.

You'll need to configure MSDTC, you can either open MMC and load the MSDTC plugin or use the following script to open inbound and outbound transactions.

https://technet.microsoft.com/en-us/library/cc731495.aspx

REG QUERY "HKLM\Software\Microsoft\MSDTC\Security" /v NetworkDtcAccessREG QUERY "HKLM\Software\Microsoft\MSDTC\Security" /v NetworkDtcAccessTransactionsREG QUERY "HKLM\Software\Microsoft\MSDTC\Security" /v NetworkDtcAccessInboundREG QUERY "HKLM\Software\Microsoft\MSDTC\Security" /v NetworkDtcAccessOutboundPAUSEREG ADD "HKLM\Software\Microsoft\MSDTC\Security" /f /v NetworkDtcAccess /t REG_DWORD /d 1REG ADD "HKLM\Software\Microsoft\MSDTC\Security" /f /v NetworkDtcAccessTransactions /t REG_DWORD /d 1REG ADD "HKLM\Software\Microsoft\MSDTC\Security" /f /v NetworkDtcAccessInbound /t REG_DWORD /d 1REG ADD "HKLM\Software\Microsoft\MSDTC\Security" /f /v NetworkDtcAccessOutbound /t REG_DWORD /d 1PAUSEnet stop MSDTCnet start MSDTCPAUSE

I ran into the same error, however it wasn't as simple as the Distributed Transaction Coordinator service from not running. I received a driver update automatically through windows that was causing issues with COM+ and not allowing MSDTC to communicate properly even though the MSDTC service was running. In my case, it was an issue with HP hotkey drivers but in researching I found other reports of issues with audio drivers from other manufacturers causing this as well.

To check to see if you have a similar issue, launch Component Services (dcomcnfg.exe), then expand Component Services > Computers > My Computer, from here click on 'COM+ Applications' to see if an error will pop-up with "COM+ unable to talk to Microsoft Distributed Transaction Coordinator" or there will be a red error over the icon for My Computer in the navigation.

The fix for me was to disable the 'HP Hotkey Service" and "HotKeyServiceUWP" services. Once those were disable, MSDTC immediately started working.