Cannot define a rule with a port range
Ubuntu 16.04 4.4.0-38
If I try to define a port range using a : as delimiter as explained by the help message which appears when hovering the mouse over the port field, it is impossible to save the rule: the add button remains greyed out: https:/
If I use a - instead, the rule can be saved but is rejected as error: "port 5900-5902 > ERROR: Bad port '5900-5902'"
There is no way out of this issue.