Overview
Following certain Microsoft security updates, you may find that DeltaWMS fails to launch properly. The application may flash briefly on screen without displaying the login box or database dropdown. This issue is caused by changes to DCOM authentication levels introduced by Microsoft security updates. This article explains why this happens and how your IT team can resolve it.
Symptoms
When this issue occurs, you'll experience one or more of the following:
DeltaWMS flashes briefly when launched.
The login box doesn't appear.
The database dropdown is blank or doesn't display.
The application fails to establish a connection.
Why this happens
Microsoft has released security updates that change how applications communicate using DCOM (Distributed Component Object Model) services. These updates increase the authentication level required for DCOM applications to RPC_C_AUTHN_LEVEL_PKT_INTEGRITY, which can prevent DeltaWMS from launching correctly.
The Microsoft update addresses a security vulnerability CVE-2021-26414, which relates to DCOM server security feature bypass.
Resolution
⚠️Important: This issue can only be resolved by your internal IT team. Our support team cannot make the necessary system-level changes to fix this issue.
To resolve this issue, your IT team will need to adjust DCOM authentication settings on affected systems. Microsoft provides detailed guidance on managing these changes.
Share this information with your IT team:
Forward the following Microsoft support article to your IT team: KB5004442: Manage changes for Windows DCOM Server Security Feature Bypass (CVE-2021-26414)
This article explains:
The reason behind the security update.
How to raise the authentication level for specific applications.
Configuration options to maintain security whilst restoring application functionality.
Your IT team will be able to implement the appropriate changes based on your organisation's security policies and requirements.
Environment requirements
This issue affects DeltaWMS version 8 and later when Microsoft DCOM security updates have been installed.