Shopify integrator PORT

I have question about shopify , for ERPNEXT-SHOPIFY integration what inbound and outbound port should be open in erpnext server ?
we use Private app type due our erpnext in local server .

Nothing in special, communication happens via web.

there is access to web port of erpnext server , buy shopify integrator not work , what do you thing ?

Do you get an error?

no , just this massage “Queued for syncing. It may take a few minutes to an hour if this is your first sync.” but nothing happened after that .