RE: [ActiveDir] Ports during authentication/logons...

[David Adner]

I would normally look at the IPSec route, too, but it's not (as far as I know) supported by MS between domain members and DC's.  It's supposed member<->member and DC<->DC, but not members<->DC's.  At least, not if Kerberos is used.  Not sure how they feel about certs.  Shared keys just wouldn't be an option.   Specifically, though, they have their backs up with 135.  Do you know what's using it during a logon/GPO process/?? From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Rick Kingslan Sent: Wednesday, August 24, 2005 10:51 PM To: ActiveDir@mail.activedir.org Subject: RE: [ActiveDir] Ports during authentication/logons... David,   If you really, really want to use the absolute minimum ports through a firewall, use IPSec tunnel mode.  However, your Network Engineers (or whoever manages your Firewalls) may not like it.  Reason?  Likely the same reason that I got when I suggested this at a previous employer:   “Well, if you put it in IPSec tunnels, then we won’t be able to see or sniff it.”   My question:  “Why do you need to sniff or see it?”   No answer….   Rick   From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of David Adner Sent: Wednesday, August 24, 2005 10:31 PM To: ActiveDir@mail.activedir.org Subject: [ActiveDir] Ports during authentication/logons...   It's been a few weeks, so time for another question on ports. MS's whitepaper that discusses how to setup AD to communicate through a firewall (the one that focuses primarily on DC to DC communication) lists the following ports needed to service "User Login and Authentication" and "Computer Login and Authentication": 445 TCP/UDP 88 TCP/UDP 389 UDP 53 TCP/UDP (I would add ICMP for GPO processing.) Most people who normally respond to "what ports are needed..." include 135. I just ran a Netmon trace during a logon from an XP machine and do see some traffic hitting 135. I also see traffic hitting 137 and 139. I'm not good at reading traces so I don't really know what's happening besides the basic traffic flow. Does anyone know what 135 (and 139 I suppose) are being used for? And if they're blocked does it totally break everything or just limit certain functions? I am not worried about DC to DC communication. The scenario is member systems separated from DC's with a firewall and the network folks want to allow the absolute minimum ports. Thx