Error writing to tags

I have configured a new gateway using license - (removed) which is a temporary license expiring 28 Feb. The new gateway is on a virtual server which w plan to replace our existing server. I have imported a backup from the running gateway and copied the relevant databases to the new server.
From designer the project gateway state is read/write but I have two problems.

  1. I cannot launch projects from the webpage on a remote server although I can launch projects using the client launcher.
  2. more serious i cannot write to a tag from the client i get the error "Error writing to tag … Gateway Comm Mode is not Read/Write.

help please

Problem 2 above has been resolved. There was a client startup script that placed the gateway mode not read write depending upon the gateway address. As the gateway address had chnged this no longer allowed read/write mode.

The problem relating to launching projects from the webpage remains

I would check to see if you have antivirus installed that could be blocking Java Web Start. Java Web Start would be the difference between the Native Client Launcher and launching from the gateway.