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Faculty of Mathematics

Troubleshooting laptop network issues

Getting connected

If you're having difficulty connecting to the Internet from your laptop, try these steps first.

  • Use DHCP ("obtain an IP address automatically") to obtain your IP address and DNS settings.
  • Check that your web browser connects directly to the Internet (your home University's proxy server may not work here).
  • Set your computer's clock to the correct time (otherwise it may think web certificates have expired when they haven't). Use the Network Time Protocol to set your computer's clock automatically.
  • Low batteries often cause connection problems, so plug your laptop into the mains if possible.

If this does not help then email help@maths (append .cam.ac.uk). Please give us the following details to help us diagnose the problem.

  • Wireless connections: the most recent usage data from the web page https://www.wireless.cam.ac.uk/person/self/usage/
  • Wired connections: the information from accessing the web page http://lapserv.maths.cam.ac.uk/authstatus/ on your laptop.
  • Your office number.
  • Which network are you connecting to (eduroam, UniOfCam, wired eduroam, or the "ordinary" wired network)?
  • The operating system of your laptop (e.g. Windows, Mac or Linux).
  • Any error messages you are getting.

Printing

If you can't print from the laptop network check the following.

  • You are authenticated to the laptop network. You cannot print unless you have logged into the laptop network. Check your Internet connection by browsing the web or with the command "ping www.cam.ac.uk". If you have been disconnected and cannot reconnect, send an email to help@maths explaining this.
  • The laptop print service is running.
  • Try another printer. The one you are trying to use may have a stuck queue. If you can print to one printer but not another please tell help@maths.
  • Try to print a test page. Some files are complex and awkward to print. Printing them from a different program or using a newer printer may help.

You've checked the above, all is fine and you still cannot print from your laptop. You'll need to email us. We need the following information. Please try to include as much as possible of the following.

  • Wireless connections authenticated via Raven: the most recent entry on the wireless usage page. The data on this page is for your Raven account so it is fine to access it from your desktop if your laptop is not working.
  • Wired connections: the content you see on the status page when accessing it from your laptop.
  • What happens when you visit the webpage http://lapserv.maths.cam.ac.uk:631/printers
    Do you ...
    • Get no reply - the browser hangs
    • Get a shorter than expected list of printers - there should be around 100
    • Have no problem viewing that page
  • Which printer(s) you tried to print to
  • Which program (application) you printed from
  • The type of file you tried to print - eg webpage, pdf file, image ending in .jpg
  • The time (approx range is fine) you sent the job to the printer