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Unable to upgrade Serv-U to the latest version due to Serv-U.dll

You get an error about the Serv-U.dll file when upgrading Serv-U to the latest version.

First published date

6/19/2025 3:49 PM

Last published date

8/31/2026 3:26 PM

Overview

This article describes a fix when getting an error about renaming the Serv-U.dll file while upgrading to the latest version.

Product section

Serv-U Managed File Transfer & Serv-U FTP Server

Cause

Permission issue
Possible corruption of the Serv-U.dll file

Resolution

Make sure you have the proper permission to the Serv-U folder from C:\Program Files\RhinoSoft\

Refer to Running Serv-U under NETWORK SERVICE

Make sure you create a server snapshot before attempting the steps below.

1. Stop the Serv-U service
2. Backup the RhinoSoft folder from C:\Program Files
3. Search for the file "Serv-U.dll" from C:\Program Files\RhinoSoft\Serv-U folder
4. Rename the file and save it
5. Make sure the installer/update file is unblocked (Right click the installer file > Properties)

6. Rerun the upgrade

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