Method for providing time-critical services by means of a process control environment, in which - a server component is assigned to the services in each case and comprises at least one application instance and is formed by a process control component which can be loaded into the process control environment and can be executed there, - a separate virtual communication network is made available for each server component by means of the process control environment, - a reverse proxy of a subnetwork comprising the process control environment forwards predetermined forwarding rules corresponding to service access requests for using the services outside of the subnetwork to the respective server component by way of its virtual communication network, - the virtual communication networks are each used for all application instances of the respective server component for forwarding the service access requests, - a configuration unit for the reverse proxy determines globally valid access information in each case relating to addressing information which is valid within the subnetwork and which is assigned to the server components and/or their virtual communication networks and transfers forwarding rules mapping access information to the reverse proxy, - the configuration unit evaluates event messages of the process control environment to determine whether virtual communication networks are to be set up or deleted within the process control environment, - the configuration unit connects a new virtual communication network to be set up to the reverse proxy by means of a first control command directed at the process control environment, - the configuration unit terminates a connection of a virtual communication network to be deleted to the reverse proxy by means of a second control command directed at the process control environment, - after terminating the connection between the virtual communication network to be deleted and the reverse proxy, the configuration unit enables a removal of the respective server component from the process control environment by means of a third control command directed at the process control environment. - a server component is assigned to the services in each case and comprises at least one application instance and is formed by a process control component which can be loaded into the process control environment and can be executed there, - a separate virtual communication network is made available for each server component by means of the process control environment, - a reverse proxy of a subnetwork comprising the process control environment forwards predetermined forwarding rules corresponding to service access requests for using the services outside of the subnetwork to the respective server component by way of its virtual communication network, - the virtual communication networks are each used for all application instances of the respective server component for forwarding the service access requests, - a configuration unit for the reverse proxy determines globally valid access information in each case relating to addressing information which is valid within the subnetwork and which is assigned to the server components and/or their virtual communication networks and transfers forwarding rules mapping access information to the reverse proxy, - the configuration unit evaluates event messages of the process control environment to determine whether virtual communication networks are to be set up or deleted within the process control environment, - the configuration unit connects a new virtual communication network to be set up to the reverse proxy by means of a first control command directed at the process control environment, - the configuration unit terminates a connection of a virtual communication network to be deleted to the reverse proxy by means of a second control command directed at the process control environment, - after terminating the connection between the virtual communication network to be deleted and the reverse proxy, the configuration unit enables a removal of the respective server component from the process control environment by means of a third control command directed at the process control environment.