10:44:07.202828 tramp-maybe-open-connection (3) # Found remote shell prompt on ‘sfmg10’
10:44:07.202965 tramp-open-shell (5) # Opening remote shell ‘/bin/sh’...
10:44:07.203116 tramp-send-command (6) # exec env ENV='' HISTFILE=~/.tramp_history PROMPT_COMMAND='' PS1=\#\$\  PS2='' PS3='' /bin/sh 
10:44:07.213994 tramp-wait-for-regexp (6) # 
#$ 
10:44:07.214266 tramp-send-command (6) # (cd ~/) 2>/dev/null; echo tramp_exit_status $?
10:44:07.221967 tramp-wait-for-regexp (6) # 
tramp_exit_status 1
#$ 
10:44:07.222766 tramp-barf-unless-okay (1) # File error: ‘tramp-histfile-override’ uses invalid file ‘~/.tramp_history’
10:44:07.222877 tramp-open-shell (5) # Opening remote shell ‘/bin/sh’...failed
10:44:07.223150 tramp-maybe-open-connection (3) # Opening connection for sfmg10 using scp...failed
10:44:07.223376 tramp-process-sentinel (5) # Sentinel called: ‘#<process *tramp/scp sfmg10*>’ ‘killed