Follow this link to skip to the main content
Hurricanes: Science and Society
WebEx Testing and Troubleshooting
The Hurricane Webinars take place on a service called WebEx, an online meeting center. From your local computer, you will be able to view and hear a speaker’s presentation (no need to call in via phone, etc.). The WebEx platform also allows for questions to be asked by chat text for this forum. A very brief “tutorial”, walking participants through the functionality of the WebEx meeting portal, will occur at the start of each webinar. The webinar will be recorded for viewing at a later date.

How to test before a Hurricane Webinar

1) DO NOT use Firefox to launch WebEx.

  • In our experience Firefox just does not work well with WebEx, even though WebEx lists Firefox as supported. We have found about 75% of the technical problems we have encountered with webinar participants can be solved by using a browser other than Firefox. (Note: Firefox 64-bit is not supported by WebEx)
  • Chrome (recent version), Internet Explorer (7+), or Safari (5+) all work well.
  • Windows Vista, Windows 7, Windows 8, and Windows 10 are all supported
  • Mac OS X 10.7-10.11 are all supported
  • Some linux installed are supported.Look at for details.
  • Windows XP will not work - WebEx discontinued support in August of 2015.
  • Mobile devices can download native apps that work in recent versions of the major mobile operating systems - iOS, Android, and Windows.

2) Please conduct a browser and basic network test at the WebEx test meeting site:

It is very important to do his ahead of time to verify that it works on your computer.

  • Enter in your name and email address
  • If you have never used WebEx before, you will need to download a plug-in. Depending on the security settings on your browser or system, you may need administrator privileges to grant permission for this download.
  • If you do not get a screen that says you have a “successful connection”, then there is a problem. First, try another browser. If you continue to have problems, contact Holly Morin for help.
  • This test does not check your audio or video capabilities though WebEx. Use the other tests below.

Additional Testing
If you have experienced problems in the past, or have an unusual set-up, please consider conducting the tests below before the webinar.

3) Multimedia test

Media players are not usually a problem but for some people there are issues.
You can verify your media player at this link:

  • NOTE: On the page will offer to look for and test multiple media players. You only need one that works to see video and multimedia in WebEx.
  • The page will run a check for multimedia players.
  • If it finds players that can play video in the WebEx Meeting, it will list them and offer you to links labeled “Check Now” to verify the player.
  • Click on these links to check your media payer(s). [You only need one to work]
  • If you do not have a compatible multimedia player installed, or your media player is out of date, the page should offer you links to download and install media players that will work with WebEx.

4) Test your Set-up

WebEx uses the WebEx plugin through the browser to launch the WebEx application which is a Java app. Disabling Java or using old versions of Java can cause issues with WebEx. To test your set-up, including Java on your machine, follow the instructions below.(NOTE: WebEx also requires javascript to be enabled)

  • Follow this link to the URI WebEx portal:
  • You should see a set of tabs across the top of the page: Home, Meeting Center, Event Center, Support Center, Training Center, My WebEx
  • Be sure you are in the Meeting Center Tab (it will have a blue background)
  • Next in the left menu find the Set Up menu item and click on it. It will expose a drop-down menu with Meeting Center and Preferences
  • Click on the Meetign Center link in the drop-down menu. A new page will open in the frame to the right.
  • Next, click on the highlighted button on the page labeled Set Up. It should run a little Java to check the Java version, javascript, browser plug-in, and browser parameters.
  • You show then get a message that you have successfully Set Up WebEx on this computer.
  • If part of the test fails, it should tell you what was lacking and make suggestions to correct it.

Audio Troubleshooting

5) If you are having Audio problems in a WebEx meeting session - during a webinar

  • In the WebEx app - under the Audio menu item, choose Integrated Voice Conference
  • Confirm you have joined the conference
  • Next, in the same Audio menu, choose Speaker/Microphone Audio Test. Run the test and confirm that the correct speakers and microphone are assigned to be used by WebEx.
  • You should also verify the speaker an microphone settings in the Operating System settings as they can be out of sync and cause issues.
  • NOTE: you do not need a microphone to participate in the DOSITS Webinars - in fact, we ask that you always keep your microphone muted.
  • If you are still having audio issues, try leaving the meeting and re-joining.
  • If re-joining does not work, try re-joining with a different browser.
  • Finally, re-start your computer and re-join the meeting.
  • Sometimes audio settings on the local computer can cause problems and sometimes local network issues can prevent audio from working. Please work with your local technical support personnel to solve those issues.

If you continue to have problems connecting with WebEx, please contact Holly Morin:

Additional information about WebEx

Firewall issues
If you have trouble connecting to the WebEx service (no response at all), you may have a firewall on your network that will prevent connections to WebEx.

  • WebEx generally uses port 80 and 443 (standard web ports) during DOSITS Webinars.
  • If you do have network issues, check that the following domains and IP addresses are not blocked:
You need to open connectivity over ports 80 and 443 for the following domains:
  • all the sub-domains of and
WebEx services are offered over the following IP ranges:
  • –
  • -
  • -
WebEx may acquire new IP addresses or reassign IP addresses so this list may not be exhaustive or up to date.