[WinError 10061] No connection could be made because the target machine actively refused it

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Hello,

With all my tests I have a .bat script that calls robot:
`SET "LST_PATH=%HOMEDRIVE%\Program Files (x86)\Atlas Copco\LinuxSupportTool 2.0.0.8\LinuxSupportTool.exe"`
`robot --include open_close LST2.0.0.0/`

And in my code I call:
```
*** Settings ***
Documentation LinuxSupportTool test simple open close.
Library SikuliLibrary
Resource ${CURDIR}/resources/shared_var.resource

*** Variables ***
${IMAGE_DIR} ${CURDIR}\\img

*** Test Cases ***
LST Open Close
[Documentation] Open close LST.
[Tags] LST not_ready open_close
Start App
Close App

*** Keywords ***
Start App
Run Keyword If ${INDIVIDUAL_TESTING} == ${FALSE} Return From Keyword
Open Application %{LST_PATH}
Sleep ${APP_LOADING_TIME}

Close App
Run Keyword If ${INDIVIDUAL_TESTING} == ${FALSE} Return From Keyword
Close Application ${APP_EXE_NAME}
```
`INDIVIDUAL_TESTING` is set to true. I get:

What could be the reason for that problem?
Thanks a lot for your help :)

Reproduce the .bat command and Robot Framework test using the shown Open Application and Close Application keywords. Start by checking whether the LST_PATH executable is reachable and whether SikuliLibrary can establish its connection; done means identifying the cause of WinError 10061 and documenting a verified resolution.

Written by the indexing model from the issue text.