Ad Connect Ports
To set up ad connect ports, you open outbound network rules to cloud identity endpoints. You also allow local traffic between the sync server and your domain controllers. Teams often open wide firewall ranges to get directory sync working fast. They also grant the sync service account broad admin rights across local servers. When these roles and network paths stay wide open, one breach exposes every account. How ad connect ports work across your network The sync tool sits on a local server in
Connect Ports: the complete guide
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To set up ad connect ports, you open outbound network rules to cloud identity endpoints. You also allow local traffic between the sync server and your domain controllers. Teams often open wide firewall ranges to get directory sync working fast. They also grant the sync service account broad admin rights across local servers. When these roles and network paths stay wide open, one breach exposes every account.
How ad connect ports work across your network
The sync tool sits on a local server inside your private network. It reads user accounts, groups, and password hashes from your local domain controllers. Then it sends those updates out to your cloud tenant over encrypted web traffic.
This workflow splits into two distinct network paths. The first path links the sync server to your local domain controllers. This local link uses standard directory, remote management, and name resolution traffic. Both TCP and UDP rules must match the exact protocols your domain controllers expect.
The second path links the sync server to the public cloud identity service. This outbound link sends data over standard web ports for HTTP and HTTPS. The sync agent reaches out to check certificate lists and post account changes. Most setups do not need inbound rules from the public internet for basic sync.
What firewall rules solve and what they leave open
Strict firewall rules limit which machines can talk to your domain controllers. Locking down network paths stops rogue servers on your network from querying directory services. It also ensures the sync server only talks to known cloud endpoints.
Still, network ports and service roles only control which machine or user logs in. They do not inspect or limit what individual commands or queries do in flight. Once an admin logs into the sync server, the firewall does its job and steps aside.
Admins often connect to the sync host or backing database to fix sync errors. If they hold broad local rights, they can run any command or read sensitive records. Network rules cannot rewrite sensitive fields like emails, phone numbers, or national IDs in results. A firewall rule also cannot pause a dangerous script before it wipes user attributes. Teams need controls that inspect actions at the command level, not just the port level.
Connect Ports: architecture patterns and best practices
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Locking down sync server roles and database access
Start by scoping the service accounts that run the sync engine. Give the local directory account only the read and write rights it needs. Avoid putting the sync account into global or domain admin groups.
Next, review how your team accesses the sync server and its local database. Do not share a single admin password across the whole ops team. Require each engineer to log in with their own identity and role.
Finally, track every query and script run against the sync host during maintenance. Standard network logs only show that a port opened between two IP addresses. You need clear logs of every action taken once that session starts.
Govern statements and responses across databases and APIs
Good config and scoped roles are needed setup. They do not check single queries in flight or mask sensitive fields in returned rows. Across Postgres, MySQL, SQL Server, MongoDB, ClickHouse, Kubernetes APIs, SSH, and internal HTTP endpoints, hoop.dev runs beside each supported service as an open-source proxy, a sidecar for your database or API.
First, hoop.dev guardrails block banned queries before they run. Then hoop.dev data masking rewrites matched sensitive values in responses in memory. The audit trail records every statement and verdict per resource. Furthermore, hoop.dev holds SOC 2 Type II and is open source on GitHub.
Frequently asked questions
Do I need to open inbound ports from the internet for directory sync?
No, standard directory sync uses outbound web traffic initiated by your local sync server. You only need inbound rules on your local domain controllers for requests from the sync host.
Why does the sync server need HTTP if traffic is encrypted?
The sync server uses standard HTTP to download certificate revocation lists from public authorities. It checks these lists to verify that the HTTPS certificates for the cloud service are valid.
Can firewall rules stop an admin from exporting sensitive directory data?
No, firewall rules only check IP addresses and ports when a network session starts. Once an authorized admin connects over an open port, the firewall cannot filter their queries.