I read:

• Cannot connect to ec2 instance
• http://stackoverflow.com/questions/5635640/cannot-ssh-into-amazon-ec2-instance
• Amazon EC2 instance ssh problems
• etc...

But could not fix it: suddenly (after a year of service, no changes on my winscp settings) it gives me "network error connection timed out" (im using ec2-user) (also from the amazon console).

• Log FILE: http://pastebin.com/vNq6YQvN
• All Sites that run on it run fine
• port 22 is allowed (never changed it) (security group)
• using the correct ec2-user and domain
• via my winscp / putty i can connect to other hosting (via ssh)

update: SOLVED. I spend 2 days without looking at my own IP address .... (since it did not change the past 3 years....). Your comments made the spark in my brain. thank you so much. (and only now i find dozens of discussions from angry users that the static addresses from my provider are changed to dynamic ones: http://gathering.tweakers.net/forum/list_messages/1501005/12 ...)