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To resolve this issue from the client side:

Open the Registry Editor (Regedt32.exe) and navigate to the following registy entry:
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings
Add the following registry values:
Value Name: DisableNTLMPreAuth
Data Type: REG_DWORD
Value: 1

Keywords: EUQ SSO,cant login to EUQ SSO,cant login to EUQ,EUQ login problem,EUQ login issue

End-User Quarantine (EUQ) Single Sign-On (SSO) login problems with Internet Explorer

Interscan Messaging Security Virtual Appliance 9.1 , Interscan Messaging Security Virtual Appliance 9.0

Last updated: 2025/05/08

Solution ID: KA-0007708

Category: Configure , Troubleshoot

You are not able to log in when configuring Windows NT LAN Manager (NTLM) SSO authentication for EUQ, using Internet Explorer.

To resolve this issue from the client side:

Open the Registry Editor (Regedt32.exe) and navigate to the following registy entry:
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings
Add the following registry values:
Value Name: DisableNTLMPreAuth
Data Type: REG_DWORD
Value: 1

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