sshd and crond dead when scp large file
I am quite new to linux and today I found something strange.
One of the linux server I managed seems unable to handle large file copy. I once tried to copy 4Gig file using SCP from my other linux server (let's say I copy a 4Gig file from server A to server B), but suddenly sshd crond and perhaps other daemons on server B are down.
I can copy large files from server B to server A with no problem tho.
Where can I find logs to diagnose the problem?
What might cause sshd and other daemons sudden death?