Post by Joerg
Unfortunately one of my clients always uses Webex, which in my opinion
when compared to GoToMeeting and Adobe Net Meeting is by far the worst
performing meeting service.
Occasionally it works fine without a hitch. Not the audio but that's
what a lot of folks said as well. Doesn't bother me because we have
a. It just sits there trundling, never connects to anything.
b. It trundles until we are 10-20 minutes into the meeting, then
something starts to flicker and move, it stretches itself for another
two agonizing minutes and finally the other side's desktop shows up.
Their support obviously is only available to paying customers. Just
great. Does anyone know a common pitfall that could make this stuff hang
so often and then sometimes not hang?
Open some ports up?
Article ID: WBX264
How Do I Allow WebEx Traffic on My Network?
How do I allow WebEx traffic on my network?
How do I optimize firewall and proxy settings for use with WebEx
What ports need to be opened to use WebEx services?
What exceptions should I add to my firewall for WebEx?
What IP range is assigned to WebEx?
What settings does WebEx recommend for proxy servers?
To ensure traffic to and from the WebEx domain is routed appropriately
through your firewall or proxy servers, review the settings below:
Web browser exceptions
Add an exception for the entire webex.com domain = *.webex.com.?At the
minimum, the following addresses should be added as exceptions:
YOURSITENAME.webex.com and akamaicdn.webex.com.
and web browsers should be configured to not restrict ActiveX and/or
We ask that WebEx sites are not cached (content, IP-path) on proxy
Cisco WebEx Production IP Exceptions
Note: Due to dynamic IP address allocation, WebEx cannot guarantee your
WebEx site will operate with a given IP at all times. Therefore, it is
necessary to add the full IP address range to ensure proper connectivity
to your WebEx site in all situations.
18.104.22.168/19 (CIDR) or 22.214.171.124 - 126.96.36.199 (net range)
188.8.131.52/20 (CIDR) or 184.108.40.206 - 220.127.116.11 (net range)
18.104.22.168/20 (CIDR) or 22.214.171.124 - 126.96.36.199 (net range)
188.8.131.52/19 (CIDR) or 184.108.40.206 - 220.127.116.11 (net range)
18.104.22.168/24 (CIDR) or 22.214.171.124 - 126.96.36.199 (net range)
188.8.131.52/20 (CIDR) or 184.108.40.206 - 220.127.116.11 (net range)
18.104.22.168/18 (CIDR) or 22.214.171.124 - 126.96.36.199 (net range)
188.8.131.52/20 (CIDR) or 184.108.40.206 - 220.127.116.11 (net range)
18.104.22.168/19 (CIDR) or 22.214.171.124 - 126.96.36.199 (net range)
Ports used by the WebEx client for communication for both inbound and
Port Port Number Access Type
TCP 80 Client Access
TCP 443 Client Access - Secure Traffic (SSL Sites)
TCP/UDP 1270 Client Access (Non SSL Sites)
TCP/UDP 53 Domain Name System (DNS)
TCP/UDP 5101 MMP
TCP 8554 Audio Streaming Client Access
UDP 7500 Audio Streaming
UDP 7501 Audio Streaming
UDP 9000 VoIP/Video
UDP 9001 VoIP/Video