API get Bandwidth and Disable authentication token generation

Hi,

I have a problem about API to get Bandwidth of Virtual Servers. I use this API: curl -k -u admin:admin -H "Content-type: application/json" -X POST -d "{\"command\":\"run\", \"utilCmdArgs\": \"-c 'tmsh show ltm virtual'\"}" Every thing is fine but when I get many times, I got problem:

Bad Gateway!

The proxy server received an invalid response from an upstream server. 

The proxy server could not handle the request GET mgmt/tm/util/bash. 

Reason: Error reading from remote server 


Error 502  

I have read articles that talk about a large number of iControl REST authentication token requests. https://support.f5.com/csp/article/K16751 But this step modify vcmp guest all capabilities add { stats-isolated-mode } I get error: Syntax Error: "stats-isolated-mode" identifier doesn't match to any of the following: appliance-mode

Have solution for this 2 issue ?

Thanks