When Microsoft Dynamics NAV won't open, check server logs for errors, verify service accounts & SQL connections, restart services, clear client caches, or try replacing core client/service files with hotfixes, as common culprits include service account issues, database connectivity problems, corrupted files, or conflicts with other software like Excel, often requiring attention to event viewer logs for specific exceptions like System. Null Reference Exception.
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Microsoft Dynamics NAV Not Opening
Microsoft Dynamics NAV Not Opening
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Microsoft Dynamics NAV Not Opening What to Do?
When Microsoft Dynamics NAV won't open, it's often
due to service issues, corrupted client files, port
conflicts, or problems with dependencies like SQL
Server or Office/Excel, requiring checks in Event
Viewer, restarting services, updating/replacing
files, clearing add-in caches, or ensuring proper
permissions and unique port assignments.
Initial Checks & Quick Fixes
1. Check Event Viewer: Look in the server's Application Log for errors
related to Microsoft.Dynamics.Nav.Client.exe or the NAV Service.
2. Restart NAV Service: Stop and start the Microsoft Dynamics NAV Server
service in Windows Services.
3. Check SQL Server: Ensure the SQL Server instance is fully running and
accessible.
4. Clear Client Cache: Close NAV, open Run (Win+R), type %temp%, and
delete files in the Microsoft Dynamics NAV\Add-Ins folder.
Common Causes & Solutions
1. Server Service Issues:
● Check Event Viewer: Look for errors in the Application logs on the server for details, notes www.dynamicsuser.net.
● Start/Restart Service: Ensure the Microsoft Dynamics NAV Server service is running and set to Automatic (Delayed
Start).
● SQL Server: Verify the SQL Server is fully up and running.
2. Client-Side Problems:
● Clear Cache: Close NAV, press Win + R, type %temp%, open the Microsoft Dynamics NAV/Add-Ins folder, and
delete its contents, then restart the client.
● Replace Client Files: Stop the service, go to your install directory (e.g., C:\Program Files\Microsoft Dynamics
NAV\...\Service), and replace files from a downloaded update, overwriting existing ones.
● Office Repair: Repair your Office installation via the Control Panel if errors mention Excel or Outlook integration.
3. Permissions & Conflicts:
● User Permissions: The account running the service might lack permissions; check access rights or create a new user
via PowerShell.
● Port Conflicts: Ensure NAV's port numbers are unique and don't overlap with other services.
How To Restart NAV?
Note: You will typically need to be local admin on the
computer.
● In the left pane, choose a Microsoft Dynamics NAV
Server computer. ...
● In the center pane, choose the instance name.
● In the right pane, choose Start (if the Instance is
currently "Stopped") or Restart.
How to open Dynamics NAV?
You open the Microsoft Dynamics NAV Web client by
using a web browser from a device that has a network
connection. To open the Microsoft Dynamics NAV
Web client, you must know the name of the computer
that is running the Microsoft Dynamics NAV Web
Server components and the HTTP port that it is
running on.
Conclusion
When Microsoft Dynamics NAV (now Business Central)
stops opening, the conclusion is often a conflict with
recent Windows/Office updates (especially Excel),
corrupted client files, missing registry entries (like for
Excel), service issues (like MSMQ or server
connectivity), or an outdated version incompatible with
modern OS.
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