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This might be hard ...

I have the key ssh user so I normally sync file to server automatically, recently it stopped.

Then I tried rsync manually, it stuck there,

then I tried ssh , sometimes I can log in to the server fast , sometimes no.

And after I log in the server, it stuck after I enter into a few deeper directories...

I am wondering if there is something wrong with local linux or something else...

And there is no error messages displayed

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This sounds more like a disk issue than an ssh issue. Where have you checked for errors - I'd first have a look in /var/log/messages. Are there multiple volumes/disks involved - do you get similar behaviour on other volumes/disks? I'd be condisering running fsck on the volume in question. – barryj May 30 '11 at 9:47
  • Do you have log entries that might help?
  • What is the system load when things start to get slow?
  • Did you do a disk and file system check?
  • How is the network load on the path to your server?
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then I tried ssh , sometimes I can log in to the server fast , sometimes no

Maybe this is DNS related. check if your SSHd do some reverse lookup and check if your dns resolver is configured properly.

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