Open Ports

Port 135 is for RPC
Port 139 is for NetBIOS

The other ports are also LAN based ports that are needed to communicate over a private network. You can install a private firewall program to watch over these ports if you feel the need. Two free programs that are very popular are ZoneAlarm and Sygate. They are free to download and free to install and use.

IF you are on a private network and use Outlook to connect to a Mail server, then that would be what port 135 is open for. RPC stands for Remote Procedure Call. You cannot close this port because microsoft wont let you. NetBIOS is used for resolving computer names to IP addresses on you network. This is also good to have open to make communication on your network faster.

Hope this help you some.

By the way, before I actually acquired the program, the ZoneAlarm available on the internet was only a trial basis. After thirty days, purchase was necessary.

I own it now and am happy with it.

There is a free version of ZoneAlarm.

http://download.com.com/3000-2092-10211820.html?tag=lst-0-1

ZoneAlarm Plus and ZoneAlarm Pro are the versions you have to pay for. Sygate also has a "Pro" version that you have to pay for but there is also a free version.

http://download.com.com/3000-2092-10184369.html?tag=lst-0-1

Thanks, blubomber ~ that's the same place I went to, with no luck.

Hi Rae,
I was just looking at a couple old threads here ... er, you may well have downloaded the Plus or Pro version from another page of download.com, but it was evidently not the free version blubomber linked to above. Me's a regular ZoneAlarm user.

At any rate, because you paid you got a version with some enhanced features so that be good.

btw, if you are on a network larger in scale than a typical home network and you have something better than one of these $100 home routers you can easily control all of those ports as well as any other.

You wouldn't control them at the PC level but you can allow or deny them at the network level at the network router. In a slightly more sophisticated network using a major firewall product (i.e. Checkpoint, etc..) you can allow/deny access to each port based on the IP adress of the user or require authentication before allowing access.

Ummm.... mail serves (POP) work on port 110.

I assume you were commenting on bluebomber's earlier comment regarding the use of Outlook.

You are right that POP3 mail uses Port 110. When Outlook is used in conjunction with MS Exchange Server though it uses Port 135. That's why Outlook asks if you are connecting to POP3 mial or MS Exchange when you set it up. POP3/Port 110 is what most of would use as a typical ISP end user. In a corporate setup you'd probably be using MS Exchange/Port 135.

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