"Probability score": 0.9

"Question improvement suggestion": Please provide any recent changes to your system or software, and also specify if you have tried the solutions provided in the context.

In the meantime, based on the information you have provided, here is a suggested answer to your question:

Hello Elena,

Based on the error messages you're receiving, it seems like there might be an issue with your connection settings or a possible corruption in your termbase. Here are some steps you can take to resolve this:

Step 1: Rename the MultiTerm folder. Go to C:\Users\%User Name%\App Data\Roaming\SDL\MultiTerm and rename the MultiTerm18 folder to MultiTerm18_OLD.

Step 2: Repair the MultiTerm installation. Go to Control Panel\All Control Panel Items\Programs and Features, right-click on MultiTerm 18.0.2.3266, and select Repair.

Step 3: If the issue persists, consider installing the latest version of MultiTerm.

Step 4: If you are connected to a VPN, disconnect from it and check if the error still occurs. Some VPNs, like Nord VPN or Express VPN, have been known to cause this error.

Step 5: If you have the Sentinel One Endpoint Agent installed on your machine, this could also be causing the issue.

If none of these steps resolve your issue, it would be helpful to know if there have been any recent changes to your system or software. Also, please let us know if you've already tried any of these solutions.

I hope this answer addressed your question. If not, please reject the answer, add the question improvement suggestion information, and click the RWS Community AI checkbox on the right to try again.

RWS Community AI

Ster 1-4: Done all above.

Step 5: N/A

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

Hi, Elena

whenever I get that error message it usually means that my laptop is connected to the internet via mobile data. If you are working with mobile data on, try switching to Wi-Fi/Ethernet.

For some reason, Multiterm does not like mobile data, nor does it like VPNs.

It works fine with Wi-FI or Ethernet, though.

I hope this helps!

Regards,

Popie

Thank you! This is important!

Elena Georgiadou 

My pleasure! Suggesting this as Answer, if it worked feel free to verify it.

whenever I get that error message it usually means that my laptop is connected to the internet via mobile data. If you are working with mobile data on, try switching to Wi-Fi/Ethernet.

For some reason, Multiterm does not like mobile data, nor does it like VPNs.

It works fine with Wi-FI or Ethernet, though.

Popie