If your Jira server is on-premise, you should still be able to integrate with ProductPlan. You will need to whitelist the ProductPlan IP Addresses in your firewall so that we can make connections to your Jira server. You can make the connection through port 443.
Use these IP addresses for the connections:
[188.8.131.52] and [184.108.40.206]
Or, if you want more restrictions you can also open the following URI’s:
[/plugins/servlet/oauth/*] and [/rest/api/*]
For further assistance, please contact firstname.lastname@example.org