What is DCE endpoint resolution?
TCP port 135 is the DCE endpoint resolution point that is used by DCOM. By default, DCOM assigns ports dynamically from the TCP port range of 1024 through 65535. However, you can use Component Services to adjust the TCP port range. Enter a range of values for the Data Channel Port Range for your FTP service.
What is TCP 135 port used for?
Port 135 is used for RPC client-server communication; ports 139 and 445 are used for authentication and file sharing. UDP ports 137 and 138 are used for local NetBIOS browser, naming, and lookup functions.
Should I open port 135?
Port 135 exposes where DCOM services can be found on a machine. Therefore, port 135 should not be exposed to the internet and must be blocked.
How does DCE RPC work?
DCE/RPC is a specification for a remote procedure call mechanism that defines both APIs and an over-the-network protocol. A DCE/RPC server’s endpoint mapper (EPMAP) will listen for incoming calls. A client will call this endpoint mapper and ask for a specific interface, which will be accessed on a different connection.
How do I allow DCOM through Windows Firewall?
Click Start, Administrative Tools, Windows Firewall with Advanced Security. Click Inbound Rules, and check that that “COM+ Network Access (DCOM-In)” is enabled.
What is RPC port?
Summary. RPC dynamic port allocation is used by server applications and remote administration applications, such as Dynamic Host Configuration Protocol (DHCP) Manager, Windows Internet Name Service (WINS) Manager, and so on. As a server port, choose a port outside of the range you may want to specify below.
What is TCP 139 used for?
Port 139 is utilized by NetBIOS Session service. Enabling NetBIOS services provide access to shared resources like files and printers not only to your network computers but also to anyone across the internet.
Can I disable port 135?
Disabling TCP port 135 will NOT affect Local DCOM/Raw RPC server component because they do not need network. Disabling TCP port 135 will only affect some client machine which directly use DCOM remote activation (i.e. VB CreateObject(“Excel.
Is port 135 a security risk?
It is a sensitive port that is associated with a slew of security vulnerabilities and should never be exposed to the internet. However, Port 135 is needed in an active directory and server/client environment for many services to operate properly.