Unable to connect to Distribution Server

Problem

While trying to download the bootable media, the target machine can't connect to the Distribution Server installed machine.

Causes

1. The target machine is not in the same network as the Distribution Server.
2. The HTTP/HTTPS ports are not reachable from the target machine.
3. The HTTP/HTTPS ports are blocked in the Distribution Server by a firewall or antivirus.
4. Issues while configuring the Distribution Server.

Resolution

Ensure that the Distribution Server is reachable from the target machine.

From the target machine, follow the steps given below:

1. Open the command prompt.
2. Execute the following command: ping <distribution_server_IP> where distribution_server_ip is the IP address of the machine where the Distribution Server is running.
3. Ensure that server is reachable using ping statistics.
4. If not, contact your network administrator.

Check the reachability of the HTTP port and HTTPS port

1. Open the command prompt.
2. Execute the following commands:
   • telnet <DS Server IP> <http port number>
   • telnet <DS Server IP> <https port number>
   Example:
   • telnet 192.168.139.116 8021
   • telnet 192.168.139.116 8384
3. If it opens a blank command prompt, the port is reachable. If not, proceed to step 3.

Steps for enabling Telnet in Windows:

1. Go to Control Panel → Programs and Features.
2. Click "Turn Windows features on or off".
3. Select "Telnet client" and click OK.

Check if Windows Defender Firewall blocks HTTP or HTTPS ports

1. Navigate to Control Panel → Windows Defender Firewall on the Distribution Server machine.
2. If the firewall is disabled, proceed with Step #4.
3. If enabled, go to Advanced Settings → Inbound Rules → New Rule.
4. Select Port, specify HTTP/HTTPS port numbers (e.g., 8021, 8384).
5. Allow the connection, name the rule, and click Finish.

Check if Antivirus blocks communication

If you have antivirus software installed on the Distribution Server machine, ensure that its settings do not block communication with the target machine.

5. Check if the Distribution Server is running with a valid IP address

1. Press Windows + R, type services.msc.
2. Search for ManageEngine UEMS - Distribution Server.
3. Ensure the status of the service is "Running". If not, start the service manually.

In the web console:

1. Navigate to the Agent page → Remote Offices.
2. Check if the IP address of the Distribution Server is valid.
3. If not, click Action → Modify → Update with a valid IP address and click Modify.

If the issue persists, contact support for further assistance.