There are many services associated with the Microsoft® Windows® 2000 operating system. These services may require more than one Transmission Control Protocol (TCP) or User Datagram Protocol (UDP) port for the service to be functional. The following table shows the default ports that each service uses.
Service Name
UDP
TCP
Browsing datagram responses of NetBIOS over TCP/IP (NetBT)
138
Browsing requests of NetBT
137
Client/Server Communication
135
Common Internet File System (CIFS)
445
139, 445
Content Replication Service
560
Cybercash Administration
8001
Cybercash Coin Gateway
8002
Cybercash Credit Gateway
8000
Distributed Component Object Model (DCOM) (SCM uses UDP/TCP to dynamically assign ports for DCOM)
135
135
Domain Name System (DNS) client to server lookup (varies)
53
53
DNS Administration
139
Dynamic Host Configuration Protocol (DHCP) client
67
DHCP Manager
135
DHCP server
68
Exchange Administrator
135
Exchange Server 5.0
File shares name lookup
137
File shares session
139
File Transfer Protocol (FTP)
21
FTP-data
20
Hypertext Transfer Protocol (HTTP)
80
HTTP-Secure Sockets Layer (SSL)
443
Internet Information Services (IIS)
80
Internet Key Exchange (IKE)
500
Internet Message Access Protocol (IMAP)
143
IMAP (SSL)
993
Internet Protocol Security (IPSec) Authentication Header (AH)
IPSec Encapsulating Security Payload (ESP)
Internet Relay Chat (IRC)
531
ISPMOD (SBS 2nd tier DNS registration wizard)
1234
Kerberos de-multiplexer
2053
Kerberos klogin
543
Kerberos kpasswd (v5)
464
464
(continued)
Service Name
UDP
TCP
Kerberos krb5
88
88
Kerberos kshell
544
Layer Two Tunneling Protocol (L2TP)
1701
Lightweight Directory Access Protocol (LDAP)
389
LDAP (SSL)
636
Login Sequence
137, 138
139
Macintosh, File Services (AFP/IP)
548
Membership DPA
568
Membership MSN
569
Message transfer agent (MTA) - X.400 over TCP/IP
102
Microsoft Chat client to server
6667
Microsoft Chat server to server
6665
Microsoft Message Queue Server
1801
1801
Microsoft Message Queue Server
3527
135, 2101
Microsoft Message Queue Server
2103, 2105
NetBT datagrams
138
NetBT name lookups
137
NetBT service sessions
139
NetLogon
138
NetMeeting Audio Call Control
1731
NetMeeting H.323 call setup
1720
NetMeeting H.323 streaming RTP over UDP
Dynamic
NetMeeting Internet Locator Server (ILS)
389
NetMeeting RTP audio stream
Dynamic
NetMeeting T.120
1503
NetMeeting User Location Service
522
Network Load Balancing
2504
Network News Transport Protocol (NNTP)
119
NNTP (SSL)
563
Outlook (see for ports)
Pass Through Verification
137, 138
139
Point-to-Point Tunneling Protocol (PPTP) control
1723
PPTP data
Post Office Protocol version 3 (POP3)
110
POP3 (SSL)
995
Printer sharing name lookup
137
Printer sharing session
139
(continued)
Service Name
UDP
TCP
Remote Authentication Dial-In User Service (RADIUS) authentication (Routing and Remote Access)
1645 or 1812
RADIUS accounting (Routing and Remote Access)
1646 or 1813
Remote Install TFTP
69
Remote procedure call (RPC)
135
RPC client fixed port session queries
1500
RPC client using a fixed port session replication
2500
RPC session ports
Dynamic
RPC user manager, service manager, port mapper
135
Service Control Manager (SCM) used by DCOM
135
135
Simple Mail Transfer Protocol (SMTP)
25
Simple Network Management Protocol (SNMP)
161
SNMP Trap
162
SQL Named Pipes encryption over other protocols name lookup
137
SQL RPC encryption over other protocols name lookup
137
SQL session
139
SQL session
1433
SQL session
1024 - 5000
SQL session mapper
135
SQL TCP client name lookup
53
53
Telnet
23
Terminal Services
3389
UNIX Printing
515
Windows Internet Name Service (WINS) Manager
135
WINS NetBT name service
137
WINS Proxy
137
WINS Registration
137
WINS Replication
42
X400
102
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