No remote access

A colleague of mine has been unable to access my files despite I have allowed access. Attached how I activated remote access, which however doesn't work (instead of my files a black page is shown). Maybe do I have to update it?
MD5: ssh-rsa 2048 81:2e:4d:7b:bc:86:3c:44:0f:c1:91:07:b2:e9:95:c0
Thanks!

Giorgia

What "black page" do you mean? How are your colleagues accessing your files?