Receiving Message - An authentication error has occurred -

Receiving Message: "An authentication error has occurred" [RESOLVED]

Problem:

When logging in to gotomyerp, you receive one of the following errors and are unable to connect.
  

Reason:

This issue has happened due to a recent security update released by Microsoft on the 05/08/2018 Patch Tuesday.
The KBs that affect this behavior are the following:

On Windows 7:
KB4103718

On Windows 10:
Build 1803 -> KB4103721
Build 1709 -> KB4103727
Build  1703 -> KB4103731
Build  1607 -> KB4103723

Resolution:

This issue has now been globally resolved. If you have made these changes temporarily, please click here to view an article on reversing these changes, and securing your environment.
The solution below might require assistance from your IT department if your workstations are joined to a domain.
Please note that administrative privileges are required on the workstation to make this change (unless the workstation is part of a domain, and the change is made using Domain Group Policy)
Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:

322756 How to back up and restore the registry in Windows


Method #1 Solution:

  • Download the attached file (CredSSP.reg), and run it on your workstation. (Scroll down to the bottom of the article to download the attachment)
  • Reboot your computer
Important: Please make sure to turn off your antivirus software if you get any messages blocking this file from running.



Method #2 Solution:

Change a local policy, (or Group Policy if on a domain.)  
  • Click on Start and type: gpedit.msc
  • Navigate in the tree to: Computer Configuration > Administrative Templates > System > Credentials Delegation
  • Double click on "Encryption Oracle Remediation"
  • Click on "Enabled"
  • Select "Vulnerable" from the "Protection Level" drop down.
  • Restart your computer




Method #3 Solution: For IT Administrators:

For workstations which are joined to a domain, the easiest solution to fix this globally would be to create a GPO, and change the following setting: 
Computer Configuration > Policies > Administrative Templates > Systems > Credentials Delegation > Encryption Oracle Remediation > Enabled: Protection Level -> Vulnerable

Please note that the Group Policy above will only be added after installing the following updates to your AD servers (and rebooting):

We are aware that this currently not the most secure option, however, it was set to this up until yesterday. 
We are working on preparing our servers to accommodate the more secure settings, and will update this article when it is safe to raise your workstation's security to "Mitigation"