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- Is port 389 on AD in anyway used or required when a new client queries . . .
As you mentioned, we could not block port 389 on AD For LDAPs (LDAP SSL), TCP 636 is used for Directory, Replication, User and Computer Authentication, Group Policy, Trusts Below are the discussion about the TCP and UDP port 389 and TCP port 636 We could kindly have a check
- Service overview and network port requirements for Windows
Port: It's the network port that the system service listens on for incoming network traffic This article doesn't specify which services rely on other services for network communication For example, many services rely on the Remote Procedure Call (RPC) or DCOM features in Microsoft Windows to assign them dynamic TCP ports The Remote Procedure
- Vue d’ensemble des services et exigences relatives aux ports réseau . . .
Par conséquent, si le port de contrôle est configuré sur 4131, le port de données par défaut est 4130 La plupart des clients FTP utilisent le FTP en mode passif Les clients se connectent donc d’abord au serveur FTP avec le port de contrôle Ensuite, le serveur FTP affecte un port TCP élevé, entre 1025 et 5000 Puis le client ouvre une deuxième connexion au serveur FTP pour le
- LDAP session security settings and requirements after ADV190023 . . .
Sessions on ports 389 or 3268 or on custom LDS ports that don't use TLS SSL for a Simple Authentication and Security Layer (SASL) bind Sessions that use TLS SSL by using a predetermined port (636, 3269, or a custom LDS port), or standard ports (389, 3268, or a custom LDS port) that use the STARTTLS extended operation
- [MS-ADTS]: Using SSL TLS | Microsoft Learn
The second is by connecting to a DC on a regular LDAP port (TCP ports 389 or 3268 in AD DS, and a configuration-specific port in AD LDS), and later sending an LDAP_SERVER_START_TLS_OID extended operation In both cases, the DC will request (but not require) the client's certificate as part of the SSL TLS handshake If the client presents a
- How to use PortQry to troubleshoot Active Directory connectivity issues
This example demonstrates how to use PortQry to determine if the LDAP service is responding By examining the response, you can determine which LDAP service is listening on the port and some details about its configuration This information can be useful in troubleshooting various problems By default, LDAP is configured to listen to port 389
- 2020, 2023, and 2024 LDAP channel binding and LDAP signing requirements . . .
If this occurs on an Active Directory Domain Controller, an attacker can cause a server to make decisions that are based on forged requests from the LDAP client LDAPS uses its own distinct network port to connect clients and servers The default port for LDAP is port 389, but LDAPS uses port 636 and establishes SSL TLS upon connecting with a
- LDAP is used over port 389 although LDAPS is configured in AD
If the MMC (for example Active Directory Users and Computers) is used, the connection is still made via port 389 From a third-party application which uses the PowerShell commandlet Get-GPOReport (more details here) the active directory port is configured with 636 but in wireshark you only see connections over port 389 The commandlet Get
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