I’ve finally found a way to get a stable connection to VMware Server 2.x Backend Webapplication. But this is also bad news. The only way is using M$ Internet Explorer.
Any connection with Firefox leads to a high risk of getting the WebAccess server to crash, hang or anything else. And it also doesn’t depend if you are using Firefox on Linux, MacOS or Windows.
I really hope, that VMware get this fixed immediatly.