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Hi,

I think you mean port 3 is a Wan not a LAN? Please check your DNS settings to ensure the gateway WAN is providing the DNS entries not your MPLS.

Ian

Yes Port3 is wan connected to internet router

Did you check your DNS settings and what does the router do?

Ian

Hi,

what devices are configured with 172.16.x.x addresses?

Can you reach the 8.8.8.8 server from within your LAN or even the WAN interface?

What functions does your router provide?

Ian

the devices configured with 172.16.x.x addresses are my local dns servers, they could resolve internet domains.

i can reach 8.8.8.8 from any computer in my Lan network.

when i tried the ping diagnostic tool in my firewall i got this result:

 port1 (LAN) couldn't reach 8.8.8.8

port2 (MPLS) couldn't reach 8.8.8.8

port3 (INTERNET) could reach 8.8.8.8 and the ping works well

the devices configured with 172.16.x.x addresses are my local dns servers, they could resolve internet domains.

i can reach 8.8.8.8 from any computer in my Lan network.

when i tried the ping diagnostic tool in my firewall i got this result:

 port1 (LAN) couldn't reach 8.8.8.8

port2 (MPLS) couldn't reach 8.8.8.8

port3 (INTERNET) could reach 8.8.8.8 and the ping works well

When you do a tracers from a PC to sophos.community.com what does the report show?

Ian

The ex-sysadmin configure a Central Management server.

i think the firewall trying to reach the Central Management who not exist any more.

Sounds like you have solved the issue?

Ian

Yep fixed, Thank you so much :D

Just disable Central Management settings