Connection failed or login refused - Citrix Servers - UIM - rsp probe

Products

• DX Unified Infrastructure Management (Nimsoft / UIM)

Issue/Introduction

Log shows:

Aug 24 10:45:03:664 [7916] rsp: ConnectWMIServer: WMI connection to host <xxx.xxx.com> failed try 4
Aug 24 10:45:03:665 [7916] rsp: Cleaning up WMI
Aug 24 10:45:04:945 [5544] rsp: WMI_Provider::Init : Server <xxx.xxx.com>, User xxx\xxx
Aug 24 10:45:04:945 [5544] rsp: CoCreateInstance ok
Aug 24 10:45:04:945 [5544] rsp: User = xxx\xxx
Aug 24 10:45:04:956 [5544] rsp: Error = Access is denied.

Aug 24 10:45:04:956 [5544] rsp: Access is denied.
: rsp_wmi_error
Aug 24 10:45:04:956 [5544] rsp: WMIWrapper::InitializeWmi - ConnectServer failed: Access is denied.

Aug 24 10:45:04:956 [5544] rsp: ConnectWMIServer: WMI connection to host <xxx.xxx.com> failed try 5
Aug 24 10:45:04:956 [5544] rsp: Cleaning up WMI
Aug 24 10:45:04:956 [5544] rsp: Windows do_connect: connection failure 

Environment

Release : 20.4

Component : UIM - RSP

Resolution

How to test WMI connectivity using Microsoft Windows tools or utilities
https://knowledge.broadcom.com/external/article?articleId=34976

Helpful Microsoft documentation:
PRB: DCOM Does Not Work over Network Address Translation-Based Firewall
https://support.microsoft.com/en-my/help/248809/prb-dcom-does-not-work-over-network-address-translation-based-firewall

49154-49155 TCP ports are required for DCOM

Securing a Remote WMI Connection
https://docs.microsoft.com/en-us/windows/win32/wmisdk/securing-a-remote-wmi-connection

+

https://support.microsoft.com/en-us/topic/kb5004442-manage-changes-for-windows-dcom-server-security-feature-bypass-cve-2021-26414-f1400b52-c141-43d2-941e-37ed901c769c