RDP error Error: SECURITY_NEGO_CONNECT_FAILED (0x0002000C) after latest update

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RDP error Error: SECURITY_NEGO_CONNECT_FAILED (0x0002000C) after latest update

avatar
tonynupe

Hello,

After updating RDM to latest upadte, Feb 20, 2026. RDP is no longer working.

From the application logs, I see these constant errors:

[21/02/2026 13:52:20 - 2025.3.10.2 - 64-bit] Error: SECURITY_NEGO_CONNECT_FAILED (0x0002000C)

[21/02/2026 13:52:19 - 2025.3.10.2 - 64-bit] Info: Remaining reconnection attempts: 4

[21/02/2026 11:53:17 - 2025.3.10.2 - 64-bit] Error: SECURITY_NEGO_CONNECT_FAILED (0x0002000C)

[21/02/2026 11:53:16 - 2025.3.10.2 - 64-bit] Info: Remaining reconnection attempts: 4

[21/02/2026 11:53:07 - 2025.3.10.2 - 64-bit] Info: Remaining reconnection attempts: 4

[21/02/2026 11:53:07 - 2025.3.10.2 - 64-bit] Error: SECURITY_NEGO_CONNECT_FAILED (0x0002000C)

[21/02/2026 11:48:50 - 2025.3.10.2 - 64-bit] Error: SECURITY_NEGO_CONNECT_FAILED (0x0002000C)

[21/02/2026 11:48:49 - 2025.3.10.2 - 64-bit] Info: Remaining reconnection attempts: 4

All Comments (19)

avatar
Richard Markiewicz

Hello

I'm sorry for the inconvenience. Can you please enable session logging as described here; reproduce the problem and send me the log by PM?

Please let me know if something isn't clear

Thanks and kind regards,

Richard Markievicz

avatar
tonynupe

Hello

I'm sorry for the inconvenience. Can you please enable session logging as described here; reproduce the problem and send me the log by PM?

Please let me know if something isn't clear

Thanks and kind regards,

@Richard Markiewicz

Hi Richard,

Thanks for the quick reply,

I have reproduce the problem and the logs have been sent to support.

avatar
Richard Markiewicz

Hello

It fails very early - is it just one server you can't connect to, or many? Are you able to connect with the Microsoft client (Windows App)?

Thanks and kind regards,

Richard Markievicz

avatar
tonynupe

Hello

It fails very early - is it just one server you can't connect to, or many? Are you able to connect with the Microsoft client (Windows App)?

Thanks and kind regards,

@Richard Markiewicz

Hi Richard,

I have 4 Windows VM configured as RDP, all of them fail to connect with the same error.

I tried connecting to them using console and also a Royal TSX and those work fine.

avatar
Richard Markiewicz

Hello

This is really strange. Since these are VMs I assume they're on your local network?

Can you check that Remote Desktop Manager has "Local Network Access" in System Settings > Privacy and Security > Local Network? In conjunction with that, try disabling the sandbox mode if not disabled already (RDM > Settings > Types > Remote Desktop (RDP) > Advanced > "Active Sandboxing" > "No".

Finally, if you try with the previous version, does it work? You can downloaded 2025.3.9.2 here. No need to install it, just close the currently running RDM and launch the old version direct from the .dmg.

Please let me know if something isn't clear or you have other questions

Kind regards,

Richard Markievicz