Eclipse for Mac - Logon failed - hostname unknown

Hi,

Please help. Today my logons to SAP via eclipse stopped working, I get the message "Logon to system xxx failed (hostname 'Neil's-MacBook-Pro.local' unknown)"

This was working last week.

I've tested in windows and the connections work, but I know thats not exactly comparing apples with apples.

I'm using Eclipse Neon for Mac