vpnc-connect: hash comparison failed: (ISAKMP_N_AUTHENTICATION_FAILED)(24) check group password!
If you get this error! please check your config first for example :
cat -A /etc/vpnc/office.conf
…
IPSec secret 123456.789 $
…
Here I have a SPACE!! the result must be :
…
IPSec secret 123456.789$
…
Hope this will help.