Upgrade image

[pixel]

Hello,

I use the followin release

NMS 4.2.1.R01 GA Build 69

I try to umgrade image from NMS to omniswitch 6450 (10.92.1.3).

SSH is enabled on 6450, I can connect from putty session but when I try to upgrade image from NMS, I have the following error it seem to have a permission denied.

IP Address,Status,Message,Timestamp
10.92.1.3,,Start operation on the device ...,"Jan 8, 2020 5:00:49 pm"
10.92.1.3,IN PROGRESS,"Install configuration for device: 10.92.1.3 from Saved Configuration (AOS 6.7.2.89.R06) taken at: Jan 8, 2020 3:24:33 PM","Jan 8, 2020 5:00:51 pm"
10.92.1.3,ERROR,Failed to install configuration for device: 10.92.1.3. SSH2Exception: Permission denied,"Jan 8, 2020 5:00:52 pm"
10.92.1.3,,Finish device.,"Jan 8, 2020 5:00:52 pm"
,,Finished Installing Software. The number of devices that had errors is: 1 out of 1. The following are the devices that had errors: 10.92.1.3,"Jan 8, 2020 5:00:52 pm"

log from switch 6450 console (NMS IP = 10.92.2.38)

MON JAN 01 02:03:17 : SESSION (71) info message:
+++ [SES] Authentication failed: Session 5, access type Ssh
+++ [SES] Session 5, user "admin"
+++ [SES] Session 5, IP address 10.92.2.38

Someone have an idea to resolve?