Lync 2013 Power Point Issue

Hi Team,

I am facing one issue, I had install one Standard edition Lync 2013 and one Office web Apps server.

However when I am sharing PPT with one user I am getting on message.

" Either you've lost network connectivity or our server is too busy to handle your request. please check your network connection and try again later"

Though network is very fine and only three users are enable on lync server so no overhead on Lync FE server.

Please reply.

your comments are much appreciated.

Thanks.

rizwan