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Securing Windows NT/2000 Servers for the Internet by Stefan Norberg

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Appendix A. Well-Known Ports Used by Windows NT/2000

Sometimes it’s hard to remember what port a service is running on. For convenience, I’ve included a collection of some commonly used TCP/IP ports in Windows NT/2000 and Microsoft Back Office applications in Table 1.1.

Table A-1. TCP/IP Ports Used by Windows Services

Function

Static Ports

Windows Base Services  

Active Directory (LDAP)

TCP: 389

Active Directory (LDAP-SSL)

TCP: 636

Browsing

UDP: 137, 138

DHCP Lease

UDP: 67, 68

DHCP Manager

TCP: 135

Directory Replication

TCP: 139

UDP: 138

Direct Host

TCP: 445

DNS Administration

TCP: 135

DNS Resolution

TCP: 53

UDP: 53

Event Viewer

TCP: 139

File Sharing

TCP: 139

Global Catalog (LDAP)

TCP: 3268

Global Catalog (LDAP-SSL)

TCP: 3269

IPSec

UDP: 500 (IKE)

IP Protocol: 50 (ESP), 51 (AH)

Internet Printing Protocol (IPP)

TCP: 631

Kerberos

TCP: 88UDP: 88

Layer 2 Tunneling Protocol (L2TP)

UDP: 1701

Logon Sequence

TCP: 139UDP: 137, 138

NetLogon

UDP: 138

Pass Through Validation

TCP: 139UDP: 137, 138

Performance Monitor

TCP: 139

Point-to-Point Tunneling Protocol (PPTP)

TCP: 1723IP Protocol: 47 (GRE)

Printing

TCP: 139UDP: 137, 138

Registry Editor

TCP: 139

Server Manager

TCP: 139

Trusts

TCP: 139UDP: 137, 138

User Manager

TCP: 139

WinNT Diagnostics

TCP: 139

WinNT Secure Channel

TCP: 139UDP: 137, 138

WINS Replication

TCP: 42

WINS Manager

TCP: 135

WINS Registration

TCP: 137

Convoy Clustering (WLBS)  

Convoy

UDP: 1717

WLBS

UDP: 2504 ...

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