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
I got it to work thanks, however I restarted my computer, and now it's coming up as "not in the masternode list". When I click start, it says invalid private key (which is weird because it was working before). And when I try to edit it to check the private key, it won't let me. It also won't let me remove it.
Any ideas on this problem?