Hello everyone,

We are trying to configure our RDzUT in scenario 5 of the Redbook. We are having problems to conect to the RDzUT from outside our network and we think it must be because of the ports that the firewall must open.

Could somebody tell me which ports the RDzUT uses? Is there a configurable list somewhere? We check in the manuasl but we are not so sure that all the ports are listed.

If someone can help out, we will be very grateful!!

Thank you!

Hi Edurne,

RDz UT does not require any special TCPIP ports for network activity. Standard ports listed below , would normally need to be open through the firewall to use FTP, SSH and Telnet functions.

You may also want to try to disable your firewall (at least temporarily) to see if you're able to connect to your z/OS system.

Port number Service Use
20 FTP data The port the FTP server opens to send information back to the FTP client
21 FTP The actual port that all FTP servers bind to by default
22 SSH Secure Shell
23 Telnet Remote logins using Telnet

Are you able to get from native Linux to your z/OS?

Regards,
Domingo

Yes, we can connect from our Linux machine to the RDzUT.

And while we are in our network, there is no problem, because we have no restrictions in our firewalls for ports.

But when they are trying to connect via VPN, the scenario is different. They have firewalls where they have to open the ports and we have realized that, e.g, port 4035 is necessary to be opened because it is how RDz connects to RDzUT through JMON. And there other ports like 6715, that should be opened.

What we have observed is that RDz connects to RDzUT through 4035 and then creates a new data connection through a dynamic port range(1035,1045,1717,etc..) but we don't know which range it is. That's what we are looking for.

Otherwise our other team members from overseas will not be able to work against the same RDzUT.

Thank you for answering!!!!

Hello there,

We have managed to figure out that there is a range of ports that RDzUT uses to communicate with RDz of the users. We have been able to choose the range of ports so that they can be opened in the firewall.

Thank you very much!!

Edurne,
Glad you had some success. The full range of ports that RDz uses is as follows:
4035 RSE Server
8181 - 8211 RSE Server
6715 JES Job Monitor
8001 Debug Tool
23 Host Communications (TN3270E)
4025 Data Explorer
3015 CICS Explorer

Note these are defaults and may be changed as you desire.

RDz_John

Be aware that John is listing the default ports. The ports are configurable in the UT image if required.