Resolving outages of cable connection @ SIN

Saturday, September 22, 2018 - 21:43

Update 2: the problem is still not resolved and is being investigated by Juniper. For now, workarounds have been put in place to lower the impact. We're really sorry for the inconvenience caused.

Update: new firmware 15.1X53-D59 was uploaded onto our switches. It will be applied after reboot, which is scheduled on 2018-09-27, at 4am. After that, the problem should be resolved.

We are currently experiencing outages of cable connection at Sinkuleho dormitory. Dejvická dormitory is not affected.

A known software error has been identified in our network equipment, Juniper Junos OS 15.1X53-D58, which causes permanent authentication failure after a sufficient number of authentications. It has been fixed in the latest firmware which we are expecting to get in the coming days.

If you experience inability to connect to the academic network by cable, please contact us at and we will reboot the network switch for you asap. So far, we are unable to detect such event, but as a precaution, we will reboot each switch at 4:00am until the fix is issued.

Thank you for your understanding.