A method, system, and computer program product for detecting and enforcing compliance with access requirements for a computer system in a restricted computer network. A compliance validation configuration file is created for the computer system. A maintenance service utility is configured to launch a compliance validation executable file at a specified time during operation of the computer system. A digital hash is generated for the compliance validation executable file and for the compliance validation configuration file. A determination is made if the computer system or a computer system user is a member of a configured restricted group. If the computer system or the computer system user is a member of a configured restricted group, a determination is made if a directory site code for a subnet of the restricted computer network to which the computer system is connected corresponds to a configured and allowed site. If the directory site code does not correspond to a configured and allowed site, compliance with access requirements are enforced. Enforcement actions can include a forced logoff of the computer system user, and/or a forced shutdown of the computer system.