linuxcncrsh telnet only taking GET commands and not SET commands

Hello folks,
I'm running into an interesting situation with my telnet connection to linuxcnc via linuxcncrsh.  I have a telnet connection established, and after connecting, enabling EMCTOO, and turning the machine on I am then only able to successfully send GET commands; all my SET commands return a "SET NAK" response.  
If I connect via PuTTY, I have perfect communication.  I'm trying to command my machine from a python script.  Here is the snippet of python code that is only allowing GET's to get thru (pun intended) and not SET's:
<python linuxcncrsh 1 picture>
Is there a piece of synax I'm missing when building my write command?  I'm following each command with \r\n and encoding in ascii.   Everything looks the same as my PuTTY connection in wireshark, also.  
When I connect, handshake, enable EMCTOO, and turn the machine on I use this code bit which works no problem:
<python linuxcncrsh 2 picture>
The only difference is I write out the command rather than setting the string up as a variable to send.  

Why would linuxcncrsh Not Acknowledge all my SET commands but not my GET commands?  

Thanks and happy new year!

I forgot to mention what the linuxcnc terminal prints out, where "X" is my laptop's hostname:

Connected to X
linuxcncrsh: eof from client
linuxcncrsh: disconnecting client X (1.1)
linuxcncrsh: eof from client
linuxcncrsh: disconnecting client Default (1.0)

I get connected and am able to SET ENABLE EMCTOO and SET MACHINE ON but then get disconnected by the server (linuxcncrsh). 

Does anybody know what terminal type linuxcncrsh is set to, i.e., vt100?
What other telnet negotiations does linuxcncrsh require?

Thanks again,