Can not tell from your question what operating system is being used. The reference to multiple firewalls suggests Windows.
the FM Server appears to be at IP address 18.104.22.168 which is suprising.
The user's computer appears to be at IP address 10.104.43.201 DHCP being used?
Are they both on the same router / switch?
Are there functioning clients on the same network as the problem user? (10.104.43.XX)
Your IP addresses suggest you are an educational system, do you have an IT department?
The error messages are about communication errors, due to networking or FMP shutdowns.
The error logs on the user's computer may shed some light.