How to back up the configuration of an Enterasys C2G 124-24 switch via TFTP

Option 66 is "boot server", and has worked on every cisco ipphone I've plugged in. As you only have one server, 150 isn't necessary unless there are other "network boot" services... (everything listens to 66, cisco's listen to 150)

The way I've always dealt with this is to have a dedicated, isolated network for setting up phones. The DHCP server provides IP setting for this network and a tftp server via option 66. Reset the phone and clear network setting. It then restarts and goes through the whole shebang. The only phone that was ever a problem had been locked to a call manager -- with an unknown to us password. (extra steps were required to clear it. if it had be "secured", it would've been trash -- see also: CTL files, and encrypted configs.)

I'm not familiar with the 41G, but the 40 has a diag serial port on it. It might emit an error message -- but it's been a while since I messed with that diag port.

I would first check that you correctly have the 'nexus-startup.cfg' in your TFTP root folder, so that it's not a path issue. I suggest this because the uri error your getting would suggest the path is not found. Also - you'll need to address your syntax. Following from Nx-OS contextual help:

 tftp:  Enter URL "tftp:[//server[:port]][/path]"

Also - I would try just copying it to your flash and then to startup-config after that if it's not liking the syntax you used to copy it over.

UPDATE:

This known issue with your NX-OS version could be related, or even the root cause:

CSCud05567
Symptom : Following a system switchover, copying to bootflash on the supervisor module does not work.

Conditions : This symptom might be seen under normal operating conditions for a Cisco Nexus 7000 Series device.

Workaround : None.

Source is HERE

The good news is that this issue is only appearing from 6.1, so if you are in a position to move down to 6.0 family of NX-OS you should be good. My personal preference anyway is to stay a family behind the latest and greatest unless there's a security patch.