[Follow-up] Wi-Fi Unstable (sophiawifi2019 & eduroam)

5/13 21:00

We are aware that the following locations have been experiencing difficulties with wireless connectivity since at least the second week of May, and we are investigating the situation.

Bldg. 2, 2F
Bldg. 2, 6F – 16F (at a half area of the floor)

We apologize for any inconvenience caused.

In relation to this matter, the wireless LAN has been stopped in some areas around 9:00 p.m. today (5/13) for the investigation.


4/25 10:00
The adjustment of the Wi-Fi equipment has been completed and the system has been working since the afternoon of April 22.
We apologize for any inconvenience caused over a long period of time.

However, we ask for your understanding and cooperation in the following matters due to the performance limitations of the current wireless LAN equipment.

  1. When moving between buildings, if you do not need to use Wi-Fi immediately after moving, please turn off the wireless in advance (put your laptop to sleep mode)
    The connection and disconnection operations are repeated many times and increased the load on the equipment more than expected, when moving through the place where the wireless is unstable.
  2. We ask that you refrain from using the device in areas with unstable wireless signal, mainly outside of the buildings.
    In particular, the spaces near the Main Street crossroads, the entrance to Building 2, and the entrance to Building 6.
    There are unstable because there is no wireless LAN Access Point installed, and the devices try to use the weak signal leaked out of the building.
  3. (For faculty and staff) We recommend the use of wired LAN when using the teaching tables for classes and meetings

Please note that there may be connection problems with eduroam regardless of the time of day, and we are continuing to investigate. Please try the connection operation several times. 
We apologize for the inconvenience and thank you for your patience.



4/19 12:00 This matter is being addressed on an ongoing basis. We apologize that there are still problems with the “wireless LAN connection operation” mainly around break time.
We have determined that the problem has been caused by a defect of the Wi-Fi Controller, and we are working on a recovery procedure.

4/14 22:00 We are continuing to investigate the wireless (sophiawifi2019 and eduroam) with the manufacturer’s technical support.
We believe that the issue is caused by the equipment not performing at all as it should and suspect that the equipment is defective.
However, we have found that if we can avoid the concentration of usage, the problems can be avoided to some extent.

1. “The action of connection to  Wireless LAN” has been found to cause the most problems.
 There is no problem with using the Internet (including Zoom) via wireless LAN, after the connection.

2. “Wireless LAN connection operation” has been found to continue for 5 to 15 minutes once a high load condition occurs.
During normal times, the connection to the wireless will be completed less than 3 seconds.
On the other hand, during periods of high load, the connection to the wireless LAN takes longer or fails.

In light of the above, we ask for your cooperation in the following to the extent possible

  • Please wait a few minutes when the connection to the wireless system fails.
  • When moving between buildings, if you do not need to use Wi-Fi immediately after moving, please turn off the Wi-Fi beforehand.


4/13 15:30 The wireless roaming problem has been resolved, but the wireless connection continues to be unstable.
We apologize for any inconvenience.

We are now talking with the manufacturer whether this is due to a malfunction of the equipment.
In addition, there seems to be another case where the connection is unstable due to the concentration of users. In this case, it may improve your Wi-Fi connection by moving out of the “dense area”.



17:20 We believe now the Wi-Fi works properly. Thank you for your cooperation.




We have found that some user have difficulties to keep Wi-Fi connection when moving from one location (especially between buildings) to another.

*This is not happening to everyone.

There is a possibility of equipment failure and we are now investigating.

If you are experiencing such symptoms and cannot successfully connect to Wi-Fi after moving in campus, please refrain from using the service, or if necessary, delete your Wi-Fi settings and re-register.

We apologize for any inconvenience this may cause.