2.Installation on a standalone server By vlad / Nov 03, 2020 / CRM-User-guide share Facebook Twitter Google + LinkedIn Pinterest Email Share... Installation on a local standalone server Firewall settings Ports must be opened in the firewall (default: 3306 and 3307) Common malfunctions Error message when logging in to the software "Can`t connect to master on .." First of all, check that the feature is on in the main position (server). If the position connects within the internal network (within the office), check that you have typed the correct IP address of the server. You can see the IP address of the server at the server position: If you typed the correct address and there is still an error message. The firewall must be configured on the server to allow access to ports 3306 and 3307 or the firewall must be closed completely (unsecured).