Office Communicator 2007 R2 Share Desktop Issue

Hi

We have a share desktop problem with Office Communicator 2007 R2.

Office Communicator 2007 R2 works fine across all sites with instant messaging.
However, the share desktop function with Office Communicator only works across the LAN, currently it will not work across the WAN (Leased line between all sites). We also have an ADSL connection at each site but this only routes traffic that is required to go to external locations such as the internet.

The problem we are having is not specific to any desktop o/s.

The Office Communicator Server is located within one of our sites, and we assume it's not a bandwidth/speed issue as Live Meeting works fine across sites even when sharing a desktop & carrying out a VTC call from the same system.

As Office Communicator uses random ports (to my knowledge) I have checked with my colleagues that there are no ports blocked on the Cisco firewall – this has been confirmed to be the case for all inter-site links.

Remote desktop, VNC and Live Meeting shared desktop all work fine across the WAN, just not Office communicator share desktop  which is the company preferred option.

Any help would be greatly appreciated

Regards
Mike
itdytecnaAsked:
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itdytecnaConnect With a Mentor Author Commented:
We eventually found that the user had a faulty port & an upgrade of the software assisted with the issue.
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from_expCommented:
and what about windows firewalls and other stuff possibly blocking connection?
you see, when in a local subnet, then windows fw allows much more, then between subnets. we have seen similar problem here and it was down to windows firewall.
and about random ports: they are not totally random, but from a well defined range called "Media Ports". Range is from 60000 to 64000. At server side you configure it via OCS configuration snap-in, for Communicators - via group policy/registry key

due to security concerns we have narrowed allowed port range from 4000 ports down to 400. Everything work fine.
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Jeff_SchertzCommented:
You  can actually narrow the media port range down to as little as 40 ports and still have the same functionality.  Desktop Sharing sessions are simply RDP over RTP, so they are treated the same as A/V media connections except that A/V calls are UDP and Remote Desktop is TCP, otherwise the same ports are used.

See this article for more details: http://technet.microsoft.com/en-us/library/dd425164(office.13).aspx

Most likely some firewall is still blocked ports.  Also, do you have an Edge server deployed?  OC clients can use the internal Edge interface to 'bridge' media connections between internal firewalls.

Also read this blog article for a better understanding of media negotiation: http://www.shudnow.net/2009/08/29/office-communications-server-2007-r2-audiomedia-negotiation/
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avisharCommented:
Are there any Riverbed devices on the WAN ? these devices have known issues with OC Desktop sharing / livemeeting.
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itdytecnaAuthor Commented:
Hi

Avishar, - yes there are riverbed devices on the WAN at all all sites - do you have any links to any info re issues with OC Desktop/ livemeeting ?

checked the media Ports range this is currently set from 60000 to 64000 - am I correct that lmiting these ports may help?

Many thanks for the replies.
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from_expCommented:
limiting of this ports can improve security, but you have to solve your problem first.
have you tried to disable windows firewalls, before trying desktop sharing?
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itdytecnaAuthor Commented:
A quick further update, share desktop via ocs is working fine via vpn.
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from_expCommented:
so, is your problem solved? if yes, then please write here how you did that, please.
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avisharCommented:
You have to make sure all OCS udp media traffic is bypassed on the riverbeds, refer the last post in the below link...

http://social.microsoft.com/Forums/en-US/commmunicatorvoiceandvideo/thread/e32a77f0-c746-49fb-bafe-3ab9d59b184a
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itdytecnaAuthor Commented:
We are currently waiting for our Infrastructure team to review the Riverbed devices to see if this cures the issue.

We have since made some progress whereby updating the OCS client to the latest version has caused desktop sharing to be more consistent but this appears to be only if using Windows 7 & only occurs approximately 30% of the time,
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avisharCommented:
User had a faulty port => could you elaborate further ?
Upgrading the software => MOC ver was upgraded ?
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