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After I enabling the firewall. Neither port 22 nor 80 can be accessed. Does anyone know the reason? Thanks.
Hello,
Can you try your configuration by reversing the values of "source port" and "destination port"?
https://help.ovhcloud.com/csm/en-ie-dedicated-servers-firewall-network?id=kb_article_view&sysparm_article=KB0043450
The ports you set at Source Ports you have to set them at Destination Ports.