If you use dyndns dns service and receive the mail like this

FAILED:   updating boredom.gotdns.com: badauth: Bad authorization (username or password)

And you check your config is right, no mater what os, like debian or windows.

Use the command to test ddclient config,

root@myla:~# ddclient -daemon=0 -debug -verbose -noquiet

At the last output you will see

FAILED:   updating stansync.gotdns.com: badauth: Bad authorization (username or password)

First, make sure the name and password is correct, then restart

root@boredom:/etc/ddclient# ./ddclient

root@boredom:/etc/ddclient#tail -f /var/log/syslog
The 'ip' = is empty......
Jan  3 16:37:35 boredom ddclient[2716]: WARNING:  file /var/cache/ddclient/ddclient.cache, line 3: Invalid Value for keyword 'ip' = ''
Jan  3 16:37:35 boredom ddclient[2716]: WARNING:  file /var/cache/ddclient/ddclient.cache, line 4: Invalid Value for keyword 'ip' = ''

So, we switch to manual mode, to rm the file

rm /var/cache/ddclient/ddclient.cache

Restart
root@boredom:/etc/ddclient# ./ddclient

Still error

root@boredom:/etc/ddclient# cat /var/cache/ddclient/ddclient.cache
## ddclient-3.8.3
## last updated at Sun Jan  3 17:23:05 2016 (1451812985)
atime=0,backupmx=0,custom=0,host=boredom.gotdns.com,ip=,mtime=0,mx=,script=/nic/update,static=0,status=,warned-min-error-interval=0,warned-min-interval=0,wildcard=0,wtime=30 boredom.gotdns.com
atime=0,backupmx=0,custom=0,host=stansync.gotdns.com,ip=,mtime=0,mx=,script=/nic/update,static=0,status=noconnect,warned-min-error-interval=0,warned-min-interval=0,wildcard=0,wtime=30 stansync.gotdns.com

ip column still empty, on this occasion, we try another way...... fill in your ip on it.

root@boredom:/etc/ddclient# cat /var/cache/ddclient/ddclient.cache
## ddclient-3.8.3
## last updated at Sun Jan  3 17:23:05 2016 (1451812985)
atime=0,backupmx=0,custom=0,host=boredom.gotdns.com,ip=1.169.68.45,mtime=0,mx=,script=/nic/update,static=0,status=,warned-min-error-interval=0,warned-min-interval=0,wildcard=0,wtime=30 boredom.gotdns.com
atime=0,backupmx=0,custom=0,host=stansync.gotdns.com,ip=1.169.68.45,mtime=0,mx=,script=/nic/update,static=0,status=noconnect,warned-min-error-interval=0,warned-min-interval=0,wildcard=0,wtime=30 stansync.gotdns.com

And restart ddclient, ddclient get back to normal. Maybe......

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