Some outside organization have recently pointed out many incidents occurring on campus related to access to certain inappropriate websites, so ACCC has decided to block access to them from the On-Campus Wi-Fi System during the university winter closure.

Date: December 28, 2017 2:00 P.M. – January 4, 2018 10:00 A.M.
Summary: Blocking access to inappropriate websites from the following wireless networks:
On-Campus Wi-Fi System (utwlan-w)
On-Campus Wi-Fi System via 802.1x authentication (utwlan-x)

To see the list of the blocked websites, access the following page with your UTID-13:
https://www.cc.tsukuba.ac.jp/network/access/member_only/IPaddress.htm

Wi-Fi Protected Access II (WPA2) is a standard for encrypted communications on wireless LAN (Wi-Fi) networks, and it has been announced that some vulnerabilities are discovered in WPA2, such as encryption key theft. If a third party exploits the vulnerabilities within the range of a wireless network, your communications on the network can be intercepted. To defend against these vulnerabilities, you need to install updates to affected products.

Individual users should take the following precautions:
– Install updates to fix the vulnerabilities.
Microsoft released security updates in October, 2017.
【Microsoft Corporation Information for VU#228519】
https://www.kb.cert.org/vuls/id/CHEU-AQNMYP

If new security updates are not available for your OS, consider doing the following:

– Avoid sending important information from a website whose URL starts with “http”.
– Use a VPN.
– Use a wired network.

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【IPA Information】
https://www.ipa.go.jp/security/ciadr/vul/20171017_WPA2.html

ACCC has received reports of spam emails titled
“[ACCC] University Mailbox Quota Exceeded!”, ”ご注意！！OFFICEのプロダクトキーが不正コピーされています (Warning!! Your Office product key has been illegally copied)”, ”つくばウェブメールのアップグレード / Upgrade Your Tsukuba WebMail, etc.
Please ignore them if you receive them.

The Student Residence Hall Network, which Academic Computing & Communications Center used to manage, has been outsourced to an outside company by Division of Student Welfare since April 2017.

If you have a problem with the network, call the support desk at the phone number provided in the instruction manual.

Maintenance is to be performed on eduroam on campus as follows:

Date: Monday, February 27, 2017
Areas or Systems Affected: During this event, eduroam will be suspended for several minutes. No other campus networks will be affected.

On March 18 (Wed), 2015 at 9:00 am, ACCC will limit the possible destinations of relay mails via the receiving gateway, i.e. “smtpgwin.cc.tsukuba.ac.jp” (hereinafter referred to as “smtpgwin”) to university addresses (such as those with “tsukuba.ac.jp” or those approved by the subnetwork committee). From then on, it will be impossible to send outgoing mails (or relay mails) via smtpgwin. Originally, smtpgwin was installed to send inbound mails to university e-mail addresses. Some users, however, send outgoing mails (or relay mails) via smtpgwin. This is against ACCC’s guidelines for mail gateway operation, so ACCC has decided to take measures to stop it.

If you are using smtpgwin to relay your mails, please configure your computer not to do so by the date above.

As of Dec. 1, 2014, we have redesigned and updated the ACCC website.

ACCC frequently receives reports from outside the university that large numbers of spam emails are sent from Access Point Connections (Student Residence Hall Network System, Zengaku Information Outlet and Network System, and On-Campus Wi-Fi System). Due to this spam sending, even genuine emails sent from our university might be classified as spam. To help solve this issue, ACCC has decided to implement OP25B (Outbound Port25 Blocking), an anti-spam measure, from May 7, 2014.

This measure will block computers connected to an access point from sending emails on TCP/25 port to mail servers with IP addresses other than those of University of Tsukuba (130.158.0.0/16, 133.51.0.0/16). Please note that the measure will not prevent the computers from sending emails on TCP/25 port to the mail servers of University of Tsukuba (including that of Zengaku Computer System).