64771: Acronis Cyber Protect Cloud: how to change port 9999

Also read in:

use Google Translate

Last update: 18-11-2022


During Agent registration, you receive this error:

Couldn’t connect to host.

In aakore logs, you find this error:
"msg":"tcp bind error: listen tcp bind: address already in use"


You receive an error by backup activity:

Failed to connect to port 9999: Connection refused


Starting with version 9.0, local port 9999 is required to be open for inbound connections. This port is required for communication between agent and management components.

The error indicates that port 9999 is already used by another software, most probably by Oracle HTTP server (port 9999 being one of one of two default SOAP server ports for Oracle HTTP server).

You can check which software uses the port:

In Windows:

  1. Run:
    netstat -ano | findstr 9999
    to find the PID of the process listening on 9999
  2. Run:
    tasklist /svc /fi "pid eq <PID>"
    where <PID> is the process ID found in step 1.

In Linux:

  1. Run:
    netstat -ant | grep 9999
    to find the PID of the process listening on 9999
  2. Run:
    ps -p <PID> -o comm=
    where <PID> is the process ID found in step 1.


In Acronis Cyber Protect Cloud 21.01 (Build 26226) and later versions, Acronis Agent Core Service (aakore) uses a dynamic port by default. This applies only in case of clean installation of Build 26226 and later versions.

For earlier versions or when Build 26226 is installed over an earlier build, you can change port 9999 in Acronis configuration:

1. On the affected machine, navigate to:

  • Windows C:\ProgramData\Acronis\Agent\etc\
  • Linux /opt/acronis/etc/

2. Open aakore.yaml. For example, with Notepad.

3. In this line, change port 9999 to another port that is not currently in use:

4. Restart aakore service