Tools

Serv-U 15.5.2 Hotfix 1 Release Notes

This article provides an overview of Serv-U 15.5.2 Hotfix 1, released on August 12, 2025, and provides instructions for installing and uninstalling the hotfix.

First published date

8/13/2025 12:49 PM

Last published date

6/3/2026 7:52 PM

Overview

Recommended Installation or Upgrade Path

This hotfix requires that Serv-U 15.5.2 be installed. It addresses the following issue:

  •  After upgrade, the Serv-U Client accesses the legacy client homepage URL, and the user sees an HTTP 404 error upon login.

Product section

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

Resolution

Requirements

This hotfix is suitable for both Windows and Linux OSs, 32-bit and 64-bit. It requires Serv-U 15.5.2.102.

Installation instructions 

This hotfix is available for download by logging into the Customer Portal and navigating to the Downloads page, then selecting your product and license.

This hotfix contains the following files and folders required to upgrade your installation:  

  • In Windows OS: 

    • Client\WebClientApi\Login.json
    • Client\WebClientApi\User.json
    • Client\WebClientApi\UserInfo.json
  • In Linux OS:
    • Client/WebClientApi/Login.json
    • Client/WebClientApi/User.json
    • Client/WebClientApi/UserInfo.json

In the following procedures, the default installation directory <Serv-U-InstallDir> is:  

  • In Windows OS 

    • C:\Program Files\RhinoSoft\Serv-U 

  • In Linux OS: 

    • /usr/local/Serv-U 

Install the hotfix 

  1. Shut down all running Serv-U processes. 

  1. Right-click the tray icon and select Stop Serv-U.

  1. Back up the following files and folders: 

  • In Windows OS: 

    • <Serv-U-InstallDir>\Client\WebClientApi\Login.json
    • <Serv-U-InstallDir>\Client\WebClientApi\User.json
    • <Serv-U-InstallDir>\Client\WebClientApi\UserInfo.json

  • In Linux OS: 

    • <Serv-U-InstallDir>/Client/WebClientApi/Login.json
    • <Serv-U-InstallDir>/Client\WebClientApi/User.json
    • <Serv-U-InstallDir>/Client\WebClientApi/UserInfo.json

  1. Extract the hotfix archive to a temporary location. 

  2. Open the folder for the platform on which Serv-U is installed. 
    For example, open the Linux/64-bit folder if Serv-U is installed on a 64-bit version of Linux. 

  1. Copy the following files:

  • In Windows OS: 

    • <Extracted-Platform-path>\Client\WebClientApi\Login.json
    • <Extracted-Platform-path>\Client\WebClientApi\User.json
    • <Extracted-Platform-path>\Client\WebClientApi\UserInfo.json

  • In Linux OS: 

    • <Extracted-Platform-path>/Client/WebClientApi/Login.json
    • <Extracted-Platform-path>/Client\WebClientApi/User.json
    • <Extracted-Platform-path>/Client\WebClientApi/UserInfo.json

    1. Replace the following files with the ones you copied from the hotfix extracted path.

    • In Windows OS: 

      • <Serv-U-InstallDir>\Client\WebClientApi\Login.json
      • <Serv-U-InstallDir>\Client\WebClientApi\User.json
      • <Serv-U-InstallDir>\Client\WebClientApi\UserInfo.json

    • In Linux OS: 

      • <Serv-U-InstallDir>/Client/WebClientApi/Login.json
      • <Serv-U-InstallDir>/Client\WebClientApi/User.json
      • <Serv-U-InstallDir>/Client\WebClientApi/UserInfo.json

    1. Right-click the Serv-U Tray icon and select Start Serv-U. 
      The hotfix is installed. 

    Result 
    User no longer encounters 404 error upon login with HTTPS.

    Uninstall the hotfix

    1. Shut down all running Serv-U processes. 

    1. Right-click the tray icon and select Stop Serv-U. 

    1. Replace the following files and folders with the ones you backed up during installation: 

    • In Windows OS: 

      • <Serv-U-InstallDir>\Client\WebClientApi\Login.json
      • <Serv-U-InstallDir>\Client\WebClientApi\User.json
      • <Serv-U-InstallDir>\Client\WebClientApi\UserInfo.json

    • In Linux OS: 

      • <Serv-U-InstallDir>/Client/WebClientApi/Login.json
      • <Serv-U-InstallDir>/Client\WebClientApi/User.json
      • <Serv-U-InstallDir>/Client\WebClientApi/UserInfo.json

    1. Right-click the Serv-U application. 
      The hotfix is uninstalled. 

    For more information, contact Technical Support at  https://www.solarwinds.com/serv-u.