Trend Micro InterScan Gateway Security Appliance M-Series ...

Trend Micro InterScan Gateway Security Appliance M-Series Administrator’s Guide
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• Make sure that TFTP traffic is not being blocked by an application on the
uploading client or by some intermediate device. (TFTP is the protocol that the
appliance uses to communicate with the uploading client.)
Tip: Many personal firewalls block UDP traffic by default. TFTP uses UDP, so if
the local computer you are using has a personal firewall or a local client for a
companywide antivirus application, temporarily modify the settings on the
local computer to either allow UDP traffic or to allow such traffic from the IP
address of the local computer.