Solution to USG address mapping problem

I use the USG6000 series firewall. Overview of the situation:
1. The intranet address access to the server's intranet address business is normal.
2. The external network access server's mapped public network address business is normal.
3. Network address accesses the public network address business of the serverAbnormal
Solution ideas:
1. Is the firewall server mapping policy written properly? Do not join the security domain
2. UNtrust in the security policy -> trust whether to allow access to the server address
3. In the NAT policy, source NAT adds trust to the trust zone to allow normal access to the server address
I am here The third item failed, which caused the internal network address to access the public network address mapped by the server to be abnormal. Attached is a picture

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