Quickly check EnableTrailerSupport isn’t set in your network for http.sys (CVE-2022-21907)
Find out fast if your IIS webservers have EnableTrailerSupport enabled for https.sys in the registry. Here is a small PowerShell method.
Sysadmins of the North
Technical SysOps blog, where topics include Sysadmin, DevOps, computers, servers, web, MySQL, database, virtualization, optimization and security
Sysadmins of the North
Technical SysOps blog, where topics include Sysadmin, DevOps, computers, servers, web, MySQL, database, virtualization, optimization and security
Tag Windows Server 2022
Read MoreQuickly check EnableTrailerSupport isn’t set in your network for http.sys (CVE-2022-21907)
![[HttpException (0x80004005): The length of the URL for this request exceeds the configured maxUrlLength value.]](https://cdn.saotn.org/wp-content/uploads/2025/06/Length_of_URL_for_request_exceeds_maxUrlLength_value-11-150x150.png)
