RPC endpoint mapper (and DCOM) port 135 - TCP/UDP is an interprocess communication protocol used by windows applications on either a single PC or between PCs/Servers across a network.
Unfortunately, it’s no easy process to terminate this port without possible, undesirable side effects. Your best bet is to create an Application rule for the System process that blocks UDP and TCP out on this port.
Blocking this port may cause issues with any monitoring systems. Solarwinds (or most WMI based applications) use port 135 to connect to a windows system to retrieve data. Windows credentials are required to retrieve this data. Anonymous access will not allow data retrieval