You must have execution permissions on the node (which in practice means owning the node) in order to run bpsh on it:

bash-2.05b$ bpstat 
Node(s)                        Status       Mode       User       Group
0-1                            up           ---x------ gregory    user      
2-9                            up           ---x------ clubmask   users     
10-17                          up           ---x------ gregory    user      
18-31                          up           ---x------ clubmask   users     
bash-2.05b$ bpsh 1,3,10-12 hostname
3: Operation not permitted
n1
n10
n11
n12