Connection failed

That's the message I get when I try to connect to my husband's desktop from my computer. Under that, in the pop-up box, it says: The server "name" is available on your computer. Access the volumes and files locally."

Sometimes the icon for that computer is visible in the Finder window, but when I try to connect through it, this is the message I see: "There was an error connecting to the server "name". Check the server name or IP address, and then try again. If you are unable to resolve the problem contact your system administrator."

I think that's me. And I have checked the name and IP address. That doesn't seem to be the problem.

Interesting that I have no trouble connecting to my laptop from my desktop, and I have no problem connecting to my desktop from either my laptop or my husband's desktop. The desktops are connected through a cable into a router, and the laptop is connected wireless to the same.

I have run disk warrior and repaired permissions. When I did the latter, one of the repairs said: "Warning: SUID file 'System/Library/CoreServices/RemoteManagement/ARDAgent.app/Contents/MacOS/ARDAg ent' has been modified and will not be repaired."

Is this a clue? And what do I do now???