Windows port mapper service

Sign in. United States English. Ask a question. Quick access. Search related threads. Remove From My Forums. Answered by:. Additionally, unless a tunneling protocol is used to encapsulate traffic to Active Directory, a range of ephemeral TCP ports between to and to are required. If your computer network environment uses only Windows Server R2, Windows Server , Windows 7, or Windows Vista, you must enable connectivity over the high port range of through If your computer network environment uses Windows Server R2, Windows Server , Windows 7, or Windows Vista together with versions of Windows earlier than Windows Server and Windows Vista, you must enable connectivity over both port ranges: High port range of through Low port range of through If your computer network environment uses only versions of Windows earlier than Windows Server and Windows Vista, you must enable connectivity over the low port range of through In this encapsulated scenario, you must allow the following items through the router instead of opening all the ports and protocols listed in this topic:.

Finally, you can hard-code the port that is used for Active Directory replication by following the steps in Restricting Active Directory RPC traffic to a specific port.

The following settings are LDAP session options:. FTP is the only network protocol that has a plug-in that is included with Windows Server.

The ALG FTP plug-in supports these sessions by redirecting all traffic that meets the following criteria to a private listening port in the range of to on the loopback adapter:. NET out-of-process session states. NET State Service stores session data out-of-process. The service uses sockets to communicate with ASP.

NET that is running on a web server. Certificate Services is part of the core operating system. By using Certificate Services, a business can act as its own certification authority CA. It lets the business issue and manage digital certificates for programs and protocols such as:. For more information, see 3. The Cluster service controls server cluster operations and manages the cluster database.

A cluster is a collection of independent computers that act as a single computer. Managers, programmers, and users see the cluster as a single system. The software distributes data among the nodes of the cluster. If a node fails, other nodes provide the services and data that were formerly provided by the missing node. When a node is added or repaired, the cluster software migrates some data to that node. By default, DTLS is enabled. The Computer Browser system service maintains an up-to-date list of computers on your network and supplies the list to programs that request it.

The Computer Browser service is used by Windows-based computers to view network domains and resources. Computers that are designated as browsers maintain browse lists that contain all shared resources that are used on the network. Earlier versions of Windows-based programs, such as My Network Places, the net view command, and Windows Explorer, all require browsing capability. For example, when you open My Network Places on a computer that is running Microsoft Windows 95, a list of domains and computers appears.

To display this list, the computer obtains a copy of the browse list from a computer that is designated as a browser. If you are running only Windows Vista and later versions of Windows, the browser service is no longer required. You can use this service to adjust the advanced network settings of DHCP clients. The Distributed File System Replication DFSR service is a state-based, multi-master file replication engine that automatically copies updates to files and folders between computers that are participating in a common replication group.

It is not used on a Windows Server domain controller. The Distributed Link Tracking Server system service stores information so that files that are moved between volumes can be tracked to each volume in the domain. The Distributed Link Tracking Server service runs on each domain controller in a domain.

This service enables the Distributed Link Tracking Client service to track linked documents that are moved to a location in another NTFS file system volume in the same domain. The Distributed Transaction Coordinator DTC system service coordinates transactions that are distributed across multiple computer systems and resource managers, such as databases, message queues, file systems, or other transaction-protected resource managers.

DNS servers are required to locate devices and services that are identified by using DNS names and to locate domain controllers in Active Directory. The Event Log system service logs event messages that are generated by programs and by the Windows operating system. Event log reports contain information that you can use to diagnose problems.

You view reports in Event Viewer. The Event Log service writes events that are sent to log files by programs, by services, and by the operating system. The events contain diagnostic information in addition to errors that are specific to the source program, the service, or the component.

This service has the same firewall requirements as the File and Printer Sharing feature. Fax Service lets users use either a local fax device or a shared network fax device to send and receive faxes from their desktop programs. The File Replication service FRS is a file-based replication engine that automatically copies updates to files and folders between computers that are participating in a common FRS replica set.

FRS is the default replication engine that is used to replicate the contents of the SYSVOL folder between Windows based domain controllers and Windows Server based domain controllers that are located in a common domain. By default, the FTP control port is The default data that is used for active mode FTP port is automatically set to one port less than the control port.

Therefore, if you configure the control port to port , the default data port is port This means that the client first connects to the FTP server by using the control port. Then, the client opens a second connection to the FTP server for transferring data.

You can configure the range of high ports by using the IIS metabase. If any one of these protocols is unavailable or blocked between the client and a relevant domain controller, Group Policy will not apply or update. For a cross-domain logon, where a computer is in one domain and the user account is in another domain, these protocols may be required for the client, the resource domain, and the account domain to communicate.

ICMP is used for slow link detection. When you initiate remote group policy results reporting from a Windows Server computer, access to the destination computer's event log is required. See the Event Log section in this article for port requirements. Windows Server support the initiation of remote group policy update against Windows Server computers.

SSL is an open standard for establishing an encrypted communications channel to help prevent the interception of extremely important information, such as credit card numbers. Although this service works on other Internet services, it is primarily used to enable encrypted electronic financial transactions on the World Wide Web WWW.

Internet Authentication Service IAS performs centralized authentication, authorization, auditing, and accounting of users who are connecting to a network. These users can be on a LAN connection or on a remote connection. This system service provides NAT, addressing, and name resolution services for all computers on your home network or your small-office network. When the Internet Connection Sharing feature is enabled, your computer becomes an Internet gateway on the network.

Other client computers can then share one connection to the Internet, such as a dial-up connection or a broadband connection. They do not provide these services on the external network interface. When you use the Kerberos Key Distribution Center KDC system service, users can sign in to the network by using the Kerberos version 5 authentication protocol. As in other implementations of the Kerberos protocol, the KDC is a single process that provides two services: the Authentication Service and the Ticket-Granting Service.

The Authentication Service issues ticket granting tickets, and the Ticket-Granting Service issues tickets for connection to computers in its own domain. The License Logging system service is a tool that was originally designed to help customers manage licenses for Microsoft server products that are licensed in the server client access license CAL model.

By default, the License Logging service is disabled in Windows Server Because of legacy design constraints and evolving license terms and conditions, License Logging may not provide an accurate view of the total number of CALs that are purchased compared to the total number of CALs that are used on a particular server or across the enterprise.

License Logging is not included in Windows Server and later operating systems. We recommend that only users of the Microsoft Small Business Server family of operating systems enable this service on their servers. The Message Queuing system service is a messaging infrastructure and development tool for creating distributed messaging programs for Windows. These programs can communicate across heterogeneous networks and can send messages between computers that may be temporarily unable to connect to one another.

Message Queuing helps provide security, efficient routing, support for sending messages within transactions, priority-based messaging, and guaranteed message delivery. The Microsoft POP3 service provides email transfer and retrieval services. Administrators can use this service to store and manage email accounts on the mail server. When that specific port is in use by another application, it cannot use that port and the application may show a warning message or crash entirely.

In those situations, it is better to know which ports are in use and which application is using that specific port. That way, you can either change the port or terminate the problem causing application so that the other one works as it should. Without further ado, let me show you how to find which ports are in use in Windows Using a single command, you can get a list of all the ports that are in use by various programs.

This method is quite useful if you want to take a quick glance at the ports in use. This option lets you open the command prompt with admin rights. In the elevated command prompt window, execute the below command. You can copy the command and paste it in the command prompt window by right-clicking inside it.

In the resulting output, you will see the port number right next to the IP address ex: You can see the highlighted portion in the below image for better representation. Keep in mind that the list will not be refreshed automatically.