To support the effective, efficient, and secure use of Information Technology by Computer Sciences Students, Faculty, and Staff in Teaching, Learning, Research, and Public Service

  • The Computer Sciences WIFI service has been retired (as pf 6PM Tuesday, June 6).

    The service has beenreplaced by the campus WIFI service (UWNET and EDUROAM).

    To use UWNET, authenticate with your campus NetID and password. Visitors can use the guest registration option.

    To use EDUROAM, authenticate with your home institution ID and password (for example, bbadger@wisc.edu).

    Printing to CS printers from WIFI devices will require use of the CS Department VPN service operated by DoIT. Other than using the VPN, the printing configuration remains the same.

    The switch to the campus WIFI service provides students, faculty, staff and visitors with the unified campus WIFI service that is available across campus while reducing cost to the CS department and CSL.

    Posted Mon, 06/05/2017 - 11:20am
  • We are again experiencing frequent short network timeouts. The cause has not been identified, but the symptoms are delays in authentication, random pauses in internet applications (browsers and email clients), and possibly random pauses in desktop computers.

    We are continuing to investigate.

    Posted Mon, 05/08/2017 - 10:02am
  • Summary:

    CSL managed RedHat Enterprise Linux computers will be switching to CentOS (a free rebuild of source packages from the Red Hat Enterprise Linux). This is necessary due to the expiration of the RedHat licenses that were donated to us through a partnership between RedHat and the HTCondor project.

    The conversion will take place during the week of May 22. The conversion will not require a reboot. A more detailed schedule will be announced prior to the conversion.

    A kernel upgrade will be scheduled after the completion of the CentOS conversion. This will require a reboot of all managed CentOS (previously RHEL) computers. We expect to do the kernel upgrade the week of May 29.

    More Details:

    RedHat and CentOS:

    For the past several years, the CSL has been providing RedHat Enterprise Linux (RHEL) on our managed workstations. This was made possibly by a partnership between RedHat and the HTCondor project. Prior to that, we used CentOS, which is a free rebuild of the open source packages used in the corresponding RedHat Enterprise release. The free licenses are no longer available, so we are switching our RedHat computers to CentOS.

    In our testing, the conversion from RHEL to CentOS has been smooth, with very few user-visible differences. We do expect a few surprises, however, and will do our best to address them as they arise.

    The RHEL licenses (and support, including access to security updates) expire on May 18. That means that we have very little flexibility in scheduling the conversion. We would have preferred to make this change several months before the deadline, but due to staffing issues, that was not possible

    If you have any concerns about the conversion timing, or special situations that we need to be aware of, please send email to lab@cs.wisc.edu and we will work with you to try to mitigate the risk of the conversion.

    Posted Fri, 05/05/2017 - 10:47am
  • One AFS file server is under severe load, causing delays for any user accessing that file server. We are working to identify the cause and restore full service.

    Posted Tue, 03/28/2017 - 2:29pm
  • For the past several days, the CS Network has been subject to random performance issues, which are visible to end users in several ways, including connection timeouts, freezing desktop sessions, and failure to load web pages.

    It is possible that this problem has been occurring for a longer period of time, but now has reached a level where it is more visible with a wider impact.

    We are working to isolate the problem and then fix it.

    UPDATE Wednesday March 8: We have not identified a single cause of the problem, but have identified at least one aspect of the problem, and are working on a reconfiguration to improve the situation.

    Posted Fri, 02/24/2017 - 1:23pm

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