ssh : Write failed: Broken pipe. 

I could understand it if the Pi was idle, but when I'm still working on it makes no sense. What could be the possible reason?

I ssh from mac os x, over a LAN connection.

  • what model Pi, distribution? and have you updated and upgraded and got the latest firmware? – rob Apr 16 '15 at 9:56
  • B+, Raspbian , raspberrypi 3.12.35+. – moz ado Apr 16 '15 at 10:10
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    Try grep sshd /var/log/syslog and see if there is anything about this there. – goldilocks Apr 16 '15 at 13:09
  • Just for the sake of the argument: What kind of power supply are you using? – Bex Apr 16 '15 at 14:06
  • ...and what kind of peripheral equipment do you have connected to the Pi? What where you working with when this happened? – Bex Apr 16 '15 at 15:07

You may want to use the proper power adapter. A common charger for smartphones may also be used. You may refer https://www.raspberrypi.org/help/faqs/#powerReqs and http://elinux.org/RPi_Hardware_Basic_Setup#Power_Supply

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    While using a proper power adapter is generally a good idea, I don't understand what makes you think an improper one would be the problem in this particular case. – Bex Apr 16 '15 at 13:42
  • @Bex "proper" means according to the one advised in the link, i.e. a micro-USB, 5V, 2500mA power adapter. – xitij Apr 16 '15 at 14:57
  • @goldilocks But the TS explicitly states LAN connection. – Bex Apr 16 '15 at 14:58
  • @Bex Oh yeah...my bad. I guess it still might be possible if it is seriously underpowered (<=500 mA) although I haven't heard of this particular problem. – goldilocks Apr 16 '15 at 15:02
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    @goldilocks Oh, it might very well be a problem with the power supply - it's just that nothing really indicates the power supply more clearly than a faulty LAN cable, a torn RJ45 connector, or disturbance from solar flares. – Bex Apr 16 '15 at 15:05

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