Port 135: Port 135 is mainly used to provide DCOM (Distributed Component Object Model) services by using RPC (Remote Procedure Call) protocol.

Port Description: Port 135 is mainly used to provide DCOM (Distributed Component Object Model) services by using RPC (Remote Procedure Call) protocol. Through RPC, you can ensure that the programs running on the computer are smooth.

Executing code on a remote computer; Using DCOM, we can communicate directly through the network and transmit across various networks including HTTP protocol.

Port vulnerability: I believe that many Windows 2000 and Windows XP users were infected with the "Shockwave" virus last year, which used RPC vulnerabilities to attack computers. There are loopholes in RPC itself when dealing with message exchange through TCP/IP, which is caused by improper handling of messages with incorrect format. This vulnerability will affect the interface between RPC and DCOM, which listens on port 135.

Operation suggestion: In order to avoid the attack of "shock wave" virus, it is recommended to close this port.