There are some reasons for such a behaviour:
- Basically every connection thru the GW will only get a part of the possible ISP speed, so one client doing file transfer will get e.g. 10Mbps, but every additional client will also get 10Mbps as long as that is possible.
- Of much importance is the TP policy - which blades do work on the ftp connections ? If these connections can not contain malware you could exclude them from all TP blades.
- Also look into the GW logs if there are many drops and re-transmissions of FTP packets (just to be sure !)
- Lastly you should look at other connections on the GW at the time of the FTP slowness, as you could prioritize FTP over other connections using QoS.
CCSE CCTE CCSM SMB Specialist