For Open-AudIT to function, certain network ports must be enabled for communication.

Network Management Traffic for Open-AudIT installed on a Windows based server.

The following table shows the traffic required for using Open-AudIT and the related features that use each port.

 NOTE – See below for more details on Windows network port range requirements.

Network Management Traffic for Open-AudIT installed on a Linux based server.

The following table shows the traffic required for using Open-AudIT and the related features that use each port.

Network Management User Traffic for Open-AudIT

The following table shows the traffic required for a user to communicate with Open-AudIT or for Open-AudIT to communicate to the user.

Optional LDAP / MS Active Directory traffic

If you use the optional LDAP Auth, you will likely need the below ports accessible from the Open-AudIT Server to the LDAP server.

OpenLDAP and Microsoft Active Directory require the same ports.

Optional Collector Server traffic

If you are using Collectors for remote auditing you should consider the following.

Note: You may also wish to consider the day to day administration of the operating system and open-audit configurations on the server e.g. enable ssh access to the device.

Notes

Microsoft’s DCOM/WMI services typically use a large range of random ports to function.

When using a Windows installed version of Open-AudIT, RPC/DCOM/WMI uses port 135 from Open-AudIT server to client, which then informs Open-AudIT server of an available port and the target then accepts queries on that port and responds to Open-AudIT.

A typical network flow would be thus between two Windows computers (one being the Open-AudIT server, the other being the client computer being audited) would be:

1. Open-AudIT server says to client on port 135 "can we talk using DCOM/WMI?"
2. Client responds on port 135 "Yes, please use port 2000."
3. Open-AudIT server says to client on port 2000 "Here is a WMI query, please run it and return to me the result."
4. Client responds "Here is the result."

The Linux installed version of Open-AudIT does not use remote DCOM/WMI. Instead the Linux Open-AudIT server copies the audit script to the Windows target machine, then asks the Windows target machine to run the script (using RPC on port 445) and create an audit result file. The Linux server then copies the file from the target to itself for processing using Samba. Hence, the Linux Open-AudIT server does not require the range of ports open that the Windows Open-AudIT server does.

A valuable reference for Remote WMI can be found on Microsoft’s website, along with several other linked documents. Connecting to WMI on a Remote Computer - http://msdn.microsoft.com/en-us/library/aa389290(v=vs.85).aspx