What ports are 135 and 445?

[xtreme2k]

Port 135TCP is EPMAP what is it???
Port 445TCP is Microsoft-DS what is it??

any way to close theM??

 

[Sunner]

Port 135 is used by clients connecting to an Exchange server, for the innitial connection.
I dont remember all the details, but it's got something to do with the process of assigning ports for the client to access the services on the exchange box(such as the mail store).

I think 445 is used by Netbios, but on this one, Im very unsure, do a search on TechNet, there should be more details there, and for the exchange stuff as well for that matter.

 

[Taz4158]

When Windows 2000 uses port 445, and when it uses 139

In Windows 2000 you have the possibility to disable NetBIOS over TCP/IP. You do this by right-clicking on My Network Places and selecting Properties. Then right-click on the appropriate Local Area Connection icon, and select Properties. Next, click on Internet Protocol (TCP/IP) and Properties. Now click Advanced, and select the WINS tab. There you can enable or disable NetBIOS over TCP/IP. The changes take effect immediately without rebooting the system.

From now on I will refer to the "client" as the computer from where you map drives and other shared resources, and to the "server" as the computer with resources that are shared. I will also refer to NetBIOS over TCP/IP only as NBT.

If the client has NBT enabled, it will always try to connect to the server at both port 139 and 445 simultaneously. If there is a response from port 445, it sends a RST to port 139, and continues it's SMB session to port 445 only. If there is no response from port 445, it will continue it's SMB session to port 139 only, if it gets a response from there. If there is no response from either of the ports, the session will fail completely.

If the client has NBT disabled, it will always try to connect to the server at port 445 only. If the server answers on port 445, the session will be established and continue on that port. If it doesn't answer, the session will fail completely. This is the case if the server for example runs Windows NT 4.0.

If the server has NBT enabled, it listens on UDP ports 137, 138, and on TCP ports 139, 445. If it has NBT disabled, it listens on TCP port 445 only.