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Using Focus Shield protection, why there will be 502, snapshots?

The reason may have the following:

• 1.The source station downtime, intermittent card is slow.Please check the source station the survival of the state.How to check the source station status(hyperlink to a certain help)
• 2.The source station slow response timeout for 30 seconds.More than 30 seconds did not respond to requests will be Focus Shield disconnect, according to 502.
• 3.Please check stood Focus Shield DNS Settings configuration of the source IP is correct, whether also retained the wrong, has not use server IP.
• 4.Please check whether the source station firewall intercept Focus Shield node IP see the FAQ for details

• -if IP firewall intercept Focus Shield node space service provider, please contact the quotient space unlock and add white IP.
• -if the server IP firewall (security dogs, etc.) interceptor Focus Shield node, please add Focus Shield IP segment to the server firewall in the white list.
• -if you have not any firewall configuration server, please contact with your room, firewalls add Focus Shield IP segment to the room in the white list