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The possible causes explained above are valid and useful in common troubleshootings. Also duplicated/obsolete DNS records or firewall misconfigurations at the workstation level could lead to DCOM event ID 10009.<br />
In my case, this type of error started to appear every 30 minutes (01:00, 01:30 and so on, the whole day) and most of the workstations that the server failed to connect to were powered off.<br />
After digging a lot and by chance, I just find a simple solution: Stop (and set to manual startup) the Windows SBS Manager service.<br />
Server is SBS 2011 with Exchange/DC/DNS/DHCP but I really don’t use the SBS Console, so finally no more polling errors.
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The possible causes explained above are valid and useful in common troubleshootings. Also duplicated/obsolete DNS records or firewall misconfigurations at the workstation level could lead to DCOM event ID 10009.
In my case, this type of error started to appear every 30 minutes (01:00, 01:30 and so on, the whole day) and most of the workstations that the server failed to connect to were powered off.
After digging a lot and by chance, I just find a simple solution: Stop (and set to manual startup) the Windows SBS Manager service.
Server is SBS 2011 with Exchange/DC/DNS/DHCP but I really don’t use the SBS Console, so finally no more polling errors.

Another solution for Event ID 10009.

Small Business Server (SBS) is a line of server operating systems targeted at small businesses by bundling the operating system with a number of other Microsoft products that would normally need to be purchased or licensed separately. The most notable inclusions are Exchange, SQL Server, SharePoint and ISA/TMG (Microsoft's firewall and proxy server).

The Domain Name System (DNS) is a hierarchical, globally distributed system responsible for associating the name of a computer, service or other resource into an IP address for connecting to the Internet or a private network. Most prominently, it translates domain names to the numerical IP addresses needed for the purpose of computer services and devices worldwide.

The Windows operating systems have distinct methodologies for designing and implementing networks, and have specific systems to accomplish various networking processes, such as Exchange for email, Sharepoint for shared files and programs, and IIS for delivery of web pages. Microsoft also produces server technologies for networked database use, security and virtualization.