Hi Elena

Frome the first part of the error message, it looks like you are trying to connect to Trados GroupShare - I think (someone fmo RWS may say I'm wrong!) that's the only place where "MultiTerm Server" is used.  Just to confirm that, do you see the Administrator control at the bottom left of the MultiTerm window:

That only appears if you have configured to connect a GroupShare server.  Then, of course, to add a Termbase, you use this button

rather than this one:

If you have GroupShare, but can't see the Administrator tab, go to File/Setup/Servers and edit or add your server connection.  Of course, in GroupShare, you need to confirm that you have the rights to create a Termbase.

Of course, if you don't have GroupShare, none of this is relevant!  In that case, try this article:

A connection to SDL MultiTerm Server unknown could not be established. Please check your connection settings - 3. MultiTerm - Trados Studio - RWS Community

It seemed to give a solutions for that case.

Hope that helps - Rob

Hi Elena

Frome the first part of the error message, it looks like you are trying to connect to Trados GroupShare - I think (someone fmo RWS may say I'm wrong!) that's the only place where "MultiTerm Server" is used.  Just to confirm that, do you see the Administrator control at the bottom left of the MultiTerm window:

That only appears if you have configured to connect a GroupShare server.  Then, of course, to add a Termbase, you use this button

rather than this one:

If you have GroupShare, but can't see the Administrator tab, go to File/Setup/Servers and edit or add your server connection.  Of course, in GroupShare, you need to confirm that you have the rights to create a Termbase.

Of course, if you don't have GroupShare, none of this is relevant!  In that case, try this article:

A connection to SDL MultiTerm Server unknown could not be established. Please check your connection settings - 3. MultiTerm - Trados Studio - RWS Community

It seemed to give a solutions for that case.

Hope that helps - Rob

Hi Robert,

Thank you for your answer and time.

I don't have a GroupShare server. I also tried the instructions of the link provided, but unfortunately I still have the same issue.

Actually, I run to the following error:

INFO [2025-05-20 09:09:52,220] Sdl.MultiTerm.Desktop.Platform.Implementation.Services.UpdateService - TrueUpdate Process Id: 26696has exited
INFO [2025-05-20 09:09:52,220] Sdl.MultiTerm.Desktop.Platform.Implementation.Services.UpdateService - Trying to read file:C:\Users\elena\AppData\Local\Temp\MultiTerm18Updates\FilteredUpdates.xml
INFO [2025-05-20 09:09:52,220] Sdl.MultiTerm.Desktop.Platform.Implementation.Services.UpdateService - File not found
INFO [2025-05-20 09:09:57,282] ActionService - Start#Id=xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx#Name=MultiTerm.Studio.TermbaseOpenAction#ProcessName=MultiTerm#PhysicalMemorySize=176824320#VirtualMemorySize=93552640#ThreadCount=38#HandleCount=1294#GdiHandleCount=408#UserHandleCount=276#TotalProcessorTime=00:00:12.0312500
FATAL [2025-05-20 09:09:57,741] Sdl.MultiTerm.Desktop.Platform.UnhandledException - A connection to MultiTerm Server unknown could not be established.

Please check your connection settings
System.NullReferenceException: Object reference not set to an instance of an object.
   at Sdl.MultiTerm.TMO.Interop.TermbaseRepositoryClass.Connect(String UserId, String Password)
   at Sdl.MultiTerm.Core.Common.DataContainers.TermbaseConnector.Init()
   at Sdl.MultiTerm.Core.Common.DataContainers.TermbaseConnector..ctor()
   at Sdl.MultiTerm.Studio.Editor.TermbaseService.get_Connector()
   at Sdl.MultiTerm.Studio.Editor.Actions.TermbaseOpenAction.Execute(ITermbaseService termbaseService)
INFO [2025-05-20 09:09:57,741] Sdl.MultiTerm.Desktop.Platform.UnhandledException - A connection to MultiTerm Server unknown could not be established.

Please check your connection settings#ProcessName=MultiTerm#PhysicalMemorySize=183001088#VirtualMemorySize=96681984#ThreadCount=40#HandleCount=1383#GdiHandleCount=425#UserHandleCount=303#TotalProcessorTime=00:00:12.5156250
INFO [2025-05-20 09:10:01,320] ActionService - Finish#Id=xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx#Name=MultiTerm.Studio.TermbaseOpenAction#ProcessName=MultiTerm#PhysicalMemorySize=185409536#VirtualMemorySize=97603584#ThreadCount=40#HandleCount=1389#GdiHandleCount=439#UserHandleCount=307#TotalProcessorTime=00:00:13.2031250
INFO [2025-05-20 09:10:04,118] StudioInstanceDiscovery - Unregistered object from running object table: 65536

Any furthe suggestions are highly appreciated

Thanks

Elena

Hi Elena

I'm afraid I can't find anything much else on this - you might look at:

Error 'A connection to SDL MultiTerm Server unknown could not be established.' when connecting to a server or file-based termbase

- Error when selecting Default Layout in SDL MultiTerm: Specified argument was out of the range of valid values. Parameter name: i - RWS Customer Support

- Error 'A connection to MultiTerm Server unknown could not be established.' when connecting to a server or file-based termbase - RWS Customer Support

- Studio 2019 SR2 error "A connection to SDL MultiTerm Server ... could not be established. Could not load file or assembly 'ICSharpCode.SharpZipLib, Version=1.0.0.999" - RWS Customer Support

or more generally, check the gateway site here:

A connection to SDL MultiTerm Server unknown could not be established Search - RWS Customer Support

Of if you can't find anything in any of those, then I'd suggest you contact RWS support direct - if you don't have an SMA, your local reseller should be able to help you.

Regards

Rob