Is there a way to change the NetMri configuration collection credentials for many devices at the same time?

 There is no way to select several devices in the NetMRI and force them to re-guess the credentials to be used for config file collection. You can either reset for all the devices in "Settings" "Setup" "Telnet/SSH Credentials" "Reset ALL Authentication Info"  or you can reset a single device in the "Device Viewer" "Settings" "Config File Collection" "Reset Authentication Info"