[Solved]"Connection editor"fails connecting Alfa AWUS036 usb

[amorales]

Hi:
After migrating from jessie to stretch and installing wireless-tools, wpasupplicant and installing
firmware-linux-nonfree and firmware-misc-nonfree for the wifi usb alfa AWUS036 which uses the Ralink rtl8187 driver, the KDE "Connection editor" does not connect. I think the card is working since editing the connection and looking the detected SSID all the nets around are detected correctly. The "Connection editor" was configurated as
Mode: Infrastructure. Security: WPA & WPA2 Personal. IPv4 Method: Automatic. "Connection editor" responses after seconds: "The wifi network could not be found" in spite that all nets are displayed.
With the same configuration and same card in jessie was working very well.
I am asking for help to fix the problem.
Thanks.

[bw123]

With the same configuration and same card in jessie was working very well.

Are you sure the configuration is the same? If the iface is not wlan0 then it could be known issue with wifi.scan-rand-mac-address

https://duckduckgo.com/html/?q="wifi.sc ... c-address"

[amorales]

Dear bw123:
Following your suggestion, I found the solution to my problem in:
https://duckduckgo.com/html/?q="wifi.sc ... ac-address"
it consisted in writing in

/etc/NetworkManager/NetworkManager.conf

the text:
[device]
wifi.scan-rand-mac-address=no
Thank you very much.