TCP and UDP Ports (Nodinite LDAP Adapter)
Use the correct TCP and UDP ports to take control of your LDAP integrations. This guide helps you enable secure, reliable, and high-performance LDAP communication for Nodinite LDAP products—whether you use BizTalk LDAP Adapter or LDAP Web API.
✅ Ensure seamless connectivity for all LDAP clients and servers
✅ Support hybrid and multi-platform environments (on-premise, cloud, Logic Apps, MuleSoft, WSO2, and more)
✅ Harden your network with clear firewall requirements
✅ Accelerate troubleshooting and integration success
When you work with LDAP, you connect multiple clients and servers across different operating systems and segmented networks. Use the table below to identify the most common and required ports for LDAP communication.
| Port Number | Port Name | Description | Comment | |
|---|---|---|---|---|
| 53 | DNS | |||
| 88 | Kerberos | |||
| 135 | RPC | Also used for DTC | ||
| 139 | NetBios-SSN | |||
| 389 | Active Directory, OpenLDAP, Fedora, Sun, NIS, ... | Default port | ||
| 443 | HTTPS | Should be used for the LDAP Web API | ||
| 445 | SMB (V2, V3) | Optional usage with Serilog file appender | ||
| 445 | msft-ds | IPsec ISAKMP | ||
| 500 or 4500 | IPsec ISAKMP | ISAKMP uses UDP as its transport protocol. ISAKMP traffic normally goes over UDP port 500 | IF NAT-T is used UDP port 4500 is used | |
| 636 | SSL/LDAPS | |||
| 1389 | OpenDS | |||
| 3268, 3269 | Global Catalog DCs | |||
| 3269 | Global Category List | |||
| 1024-500049152-65535 | RPC randomly allocated high TCP ports | |||
| 10389 | Apache Directory Server |
Ports marked with the icon are very common and you must allow them in your firewall(s) for successful LDAP integration.
You can view the dynamic port range using the following netsh commands:
from KB article 832017
- netsh int ipv4 show dynamicport tcp
- netsh int ipv4 show dynamicport udp
- netsh int ipv6 show dynamicport tcp
- netsh int ipv6 show dynamicport udp