FMS is on computer A.I can visit the program from web on computer A,but another computer B can't ,why.
If computer B is on a different network i.e external/offsite it won't be able to connect to FMS unless you have port forwarded it to allow external connections.
This may help - Port forwarding information | FileMaker
Ok，thank you，it's because of the Firewall.
Retrieving data ...