its' probably ipv6 , here's the two different formats. i've never tried it. so give it a go

addnode=[2001:0:9d38:90d7:1ce9:2c3a:a6b5:1504]
addnode=61.69.140.62
addnode=[2001:0:9d38:6abd:388b:a0d:c2ba:73c1]
addnode=97.84.236.237

dumpprivkey ?

^ two p's (lol. another error in my tutorial .. and it's only been up there 10 months or so)

if still no, you can try "help" to get a list of commands, and get proper speeling