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vSphere UI must limit the amount of time that each Transmission Control Protocol (TCP) connection is kept alive.


Finding ID Version Rule ID IA Controls Severity
V-256778 VCUI-70-000001 SV-256778r889333_rule Medium
Denial of service (DoS) is one threat against web servers. Many DoS attacks attempt to consume web server resources in such a way that no more resources are available to satisfy legitimate requests. In Tomcat, the "connectionTimeout" attribute sets the number of milliseconds the server will wait after accepting a connection for the request Uniform Resource Identifier (URI) line to be presented. This timeout will also be used when reading the request body (if any). This prevents idle sockets that are not sending HTTP requests from consuming system resources and potentially denying new connections.
VMware vSphere 7.0 vCenter Appliance UI Security Technical Implementation Guide 2023-06-15


Check Text ( C-60453r889331_chk )
At the command prompt, run the following command:

# xmllint --xpath '/Server/Service/Connector[@port="${http.port}"]/@connectionTimeout' /usr/lib/vmware-vsphere-ui/server/conf/server.xml

Expected result:


If the output does not match the expected result, this is a finding.
Fix Text (F-60396r889332_fix)
Navigate to and open:


Configure the http node with the value:



Restart the service with the following command:

# vmon-cli --restart vsphere-ui