Next, an IPsec policy must be created to restrict access to this port range to deny access to all hosts on the network.įinally, the IPsec policy can be updated to give certain IP addresses or network subnets access to the blocked RPC ports and to exclude all others. The number of ports was selected arbitrarily and is not a recommendation for the number of ports that are needed for any specific system. This reduces the number of ports that are available to RPC endpoints from 3,976 to 20. This article uses the port range of 5001 to 5021. By default, RPC dynamically allocates ports in the range of 1024 to 5000 for endpoints that do not specify a port on which to listen. There are multiple configuration tasks that must be completed in order to relocate, reduce, and restrict access to RPC ports.įirst, the RPC dynamic port range should be restricted to a smaller, more manageable port range that is easier to block by using a firewall or IPsec policy. This article discusses ways to reduce the number of ports available to RPC applications and how to restrict access to these ports by using a registry-based IPsec policy.īecause the steps in this article involve computer-wide changes that require the computer to be restarted, all these steps should be performed first in nonproduction environments to identify any application-compatibility issues that may occur as the result of these changes. This behavior can make restricting access to these ports challenging for network administrators. By default, RPC uses ports in the ephemeral port range (1024-5000) when it assigns ports to RPC applications that have to listen on a TCP endpoint. This article describes how to configure RPC to use a specific dynamic port range and how to help secure the ports in that range by using an Internet Protocol security (IPsec) policy.
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