ZyXEL Communications ES-3124PWR User Manual page 290

Chapter 37 Troubleshooting
1 You may have exceeded the maximum number of concurrent FTP sessions. Close other
FTP sessions, or try connecting again later.
2 Try to access the Switch using another service, such as HTTP. If you can access the
Switch, check the remote management and secure client settings to find out why the
Switch does not respond to FTP.
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ES-3124 Series User's Guide