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ISSUE: Cannot open the client user interface with error Invalid byte 1 of 1-byte UTF-8 sequence

Article ID: 8042
Reviewed: 08/02/2018

Product Version:
AhsayACB / AhsayOBM: 8.1 or above
OS: Windows

Problem Description

When opening the AhsayOBM / ACB user interface, the following error message is displayed:

Invalid byte 1 of 1-byte UTF-8 sequence


This issue can occurs if the AhsayOBM / ACB user settings file (e.g. ~\.obm\config\settings.sys) saved on the client computer is corrupted.


To resolve the issue, remove, then re-create the user settings file on the affected client computer.

Important: Before proceeding to the next step, ensure that you have the encryption key for all backup sets of the affected user. Re-creating the user profile will require you to enter the encryption key for all existing backup sets.

For more details and best practice for managing encryption key, refer to the following KB article: FAQ: Best practices for managing encryption key on AhsayOBM or AhsayACB

Refer to the following steps to resolve the issue:

  1. Stop the AhsayOBM / ACB services

  2. Locate the settings.sys file in the .obm / .acb folder at:

    %UserProfile%\.obm\config\settings.sys   or

    Note: Exact path to the .obm / .acb folder is saved in the home.txt file found at:

    C:\ProgramData\AhsayOBM\home.txt   or

  3. Rename the settings.sys file to BACKUP_settings.sys

  4. Login to the AhsayOBM / ACB user interface

    At this point, the client application will prompt for encryption key of all existing backup sets. You must enter the correct encryption key of each backup set to regain access to them.


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public/8042_issue/invalid_byte_1_of_1-byte_utf-8_sequence.txt · Last modified: 2019/03/28 16:49 by edward.chan

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