After launching for the first time, do this in a terminal (admin privilage):
Important
Make sure your JAVA_HOME is the same as what Sigma uses! You also need to run this tool as admin!
windows:
keytool -import -file _wildcard.sigmaclient.info+2.pem -keystore "%JAVA_HOME%\jre\lib\security\cacerts" -alias "skidmaEmulatorCert" -storepass changeit
linux:
sudo keytool -import -file _wildcard.sigmaclient.info+2.pem -keystore $JAVA_HOME/jre/lib/security/cacerts -alias skidmaEmulatorCert -storepass changeit