Network Disruptions due to Emergency Maintenance on Core Network Equipment (August to March)
(UPDATED: July 7, 2026, Schedule changed on Shiba-Kyoritsu Campus)
Emergency maintenance work on the Keio Core Backbone (BB) network equipment will be conducted as follows.
During the work, network communication at the target campuses will be affected.
Target and Impact
(1) Yagami Campus
Period: Monday, August 17, 2026, 8:00 a.m. - 10:00 a.m.
Scope: Yagami Campus
Scope: Yagami Campus
- Shin-Kawasaki Town Campus
Description: Core network equipment maintenance shutdown
Details: One outage of approximately 30 minutes will occur during the above period.
Remarks:
Details: One outage of approximately 30 minutes will occur during the above period.
Remarks:
- A planned power outage for electrical equipment safety inspection is scheduled at Yagami Campus on the same day. Please check the campus notice for details.
(2) Mita Campus
Period: Sunday, December 20, 2026, 8:00 a.m. - Noon
Scope: Mita Campus
Description: Core network equipment maintenance shutdown
Details: One outage of approximately 30 minutes will occur during the above period.
Remarks:
Scope: Mita Campus
- (Tokyo Area) eduroam wireless Wi-Fi connection
Details: One outage of approximately 30 minutes will occur during the above period.
Remarks:
- A planned power outage for electrical equipment safety inspection is scheduled at Mita Campus on the same day. Please check the campus notice for details.
- In conjunction with the shutdown in the Mita area, administrative system (ADST) services across all areas may experience partial temporary disruptions.
(3) Hiyoshi Campus
Period: Sunday, December 20, 2026, 8:00 a.m. - Noon
Scope: Hiyoshi Campus (including satellites such as the West Annex)
Scope: Hiyoshi Campus (including satellites such as the West Annex)
- Organizations using SINET L2VPN via Hiyoshi
- Osaka City Campus (KOCC)
- Tsuruoka Town Campus (TTCK)
- (Kanagawa Area) eduroam wireless Wi-Fi connection
- (All Areas) Certificate issuance service at convenience stores
Description: Core network equipment maintenance shutdown
Details: One outage of approximately 30 minutes will occur during the above period.
Remarks:
Details: One outage of approximately 30 minutes will occur during the above period.
Remarks:
- A planned power outage for electrical equipment safety inspection is scheduled at Hiyoshi Campus on the same day. Please check the campus notice for details.
- In conjunction with the shutdown in the Hiyoshi area, administrative system (ADST) services in the Kanagawa area may experience partial temporary disruptions.
(4) Shonan Fujisawa Campus
Period: Sunday, December 20, 2026, 8:00 a.m. - 10:00 a.m.
Scope: Shonan Fujisawa Campus (including the Faculty of Nursing and Medical Care and Shonan Fujisawa Junior and Senior High School)
Description: Core network equipment maintenance shutdown
Details: One outage of approximately 30 minutes will occur during the above period.
Remarks:
Scope: Shonan Fujisawa Campus (including the Faculty of Nursing and Medical Care and Shonan Fujisawa Junior and Senior High School)
Description: Core network equipment maintenance shutdown
Details: One outage of approximately 30 minutes will occur during the above period.
Remarks:
- A planned power outage for electrical equipment safety inspection is scheduled at Shonan Fujisawa Campus on the same day. Please check the campus notice for details.
- Communication between inside SFC (133.27/16, 2001:df2:c900::/48) and outside Keio is available. Communication to inside Keio (131.113/16, 2001:df0:eb::/48) is unavailable.
- Separately, a shutdown may occur due to maintenance work on the SFC-CNS side.
(5) Shinanomachi Campus
Period: Sunday, February 21, 2027, 8:00 a.m. - 10:00 a.m.
Scope: Shinanomachi Campus (including the Azabudai area)
Scope: Shinanomachi Campus (including the Azabudai area)
- Organizations using SINET L2VPN via Shinanomachi
- Tonomachi Town Campus
- (Tokyo Area) eduroam wireless Wi-Fi connection
Description: Core network equipment maintenance shutdown
Details: One outage of approximately 30 minutes will occur during the above period.
Remarks:
Details: One outage of approximately 30 minutes will occur during the above period.
Remarks:
- Scheduled power outages for a part of Shinanomachi Campus due to electrical facility safety inspections are planned on the same day. Please check the campus notices for details.
- In conjunction with the Shinanomachi area outage, services for the Research Fund Management System (Dr.Budget) may be temporarily suspended.
(6) Shiba-Kyoritsu Campus
Period: Monday, March 15, 2027, 4:30 p.m. - 6:00 p.m.
Scope: Shiba-Kyoritsu Campus
Description: Core network equipment maintenance shutdown
Details: One outage of approximately 30 minutes will occur during the above period. (Scheduled around 5:00 p.m.)
Remarks:
Scope: Shiba-Kyoritsu Campus
Description: Core network equipment maintenance shutdown
Details: One outage of approximately 30 minutes will occur during the above period. (Scheduled around 5:00 p.m.)
Remarks:
- A planned power outage for electrical equipment work is scheduled at Shiba-Kyoritsu Campus on the same day. Please check the campus notice for details.
We apologize for any inconvenience caused and appreciate your understanding and cooperation.
Last-Modified: July 9, 2026
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