First off, see our document on Using ZModem in Anzio. This will describe some of the problems associated with ZModem file transfer.
One thing to remember with the Zmodem, protocols (including Xmodem and Ymodem) is that they are old protocols designed to work over serial connections.
Commonly what we see is that someone is running Zmodem, Xmodem, Ymodem over a network connected Anzio and expecting it to work as it would over a serial connection. In about 75% of the cases it may work great. But in the other 25% of the cases, these protocols fail and usually fail badly. There are several contributing factors to this:
- network drivers - the network speed, how network traffic gets routed and buffered internally
- the X-ON/X-OFF protocol for controlling packet loss
- issues with dropped packets and getting out of synch
- problems with numerous releases and whether the one on your system has been updated to work over a network
You can play with parameters in Anzio, namely windows and buffer sizes, and you may be able to get better functionality out of it. Check with the vendor of the operating system and ask if anyone is running these protocols over network connections. However, we recommend using FTP for network file transfers. You will find FTP about 200% faster and more reliable for moving files between systems.