With no password set for "default" user, while browsing data copy plugin and we get pop up error saying "Error: failed to logon: unable to connect to the target machine."
Looking at the trace we can see the following
2 WSPROV ??? 12816 1436 0 84140977020 Selected node = 'Data Copy' 1032000
2 WSPROV ??? 12816 1026 0 84140977020 Establish connection to NETVAULT:Data Copy
2 CLISESS ??? 12816 1 0 84140981023 Sent AUD_START_CLI_SESSION_REQUEST_MSG. Wait for connect back
2 CLISESS ??? 12816 3 0 84141025364 CliInitSessionInternal: Connected to the CLI Proxy OK
0 SYSTEM ??? 12816 6 0 84141025364 SysGetEnvString : failed to get environment variable NETVAULTCLIACCOUNT - The system could not find the environment option that was entered.
2 CLISESS ??? 12816 876 0 84141025364 using the default account
0 SYSTEM ??? 12816 6 0 84141025364 SysGetEnvString : failed to get environment variable NETVAULTCLIPASSWORD - The system could not find the environment option that was entered.
2 CLISESS ??? 12816 877 0 84141025364 using the default password
2 CLISESS ??? 12816 878 0 84141025364 CliGetAccountAndPasswordExt: Checking for hook client(NETVAULT)/plugin(Data Copy)
2 CLISESS ??? 12816 4 0 84141025364 Sent CLI_PROXY_LOGON_REQUEST_MSG
2 CLISESS ??? 12816 5 0 84141057291 Got a CLI_PROXY_LOGON_REPLY_MSG
0 CLISESS ??? 12816 6 0 84141057291 Failed to logon: Unable to connect to the target machine
0 WSPROV ??? 12816 1027 0 84141057291 Failed to init CLI session: Failed to logon: Unable to connect to the target machine
0 WSPROV ??? 12816 1438 0 84141057291 Failed to get connection to plugin for VIEW_BACKUP
0 WSPROV ??? 12816 12013 0 8414000000 Error: Failed to logon: Unable to connect to the target machine
0 WSPROV ??? 12816 1152 0 84141057291 Failed to open client and plugin level of the tree