[all variants] Can't use SSH to stream media anymore

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http://ubuntuforums.org – Hi, I'm new to linux, but after install ubuntu to one of my old PCs I have used "Connect to server" to view media from different computers from each other. Just today I've been getting Host Key verification failed on both computer A and B, one of the computers is running wubi. I've had a look online for solutions but I'm still pretty confused to how to fix it (HowTos)