Are you using a Web Proxy Server by any chance on your client machines to access the Internet (and hence the Windchill System)? If so, then this can cause the behaviour that you are seeing.
To test if this is the cause, change the Browser Settings to no proxy (you will lose external Internet access for now) and then try and access the Windchill Server again. If this fixes the issue, then the proper fix is to turn switch the proxy back on again in the client machine's browser settings and do one of the followiing (depends on your site's network config):
- Tick the Bypass Proxy for Local Addresses check box
- Configure a bypass proxy host list in the browser settings with both the short and Fully Qualified Domain Name of the Windchill server in it.
It also sounds like you have an problem resolving the FQDN of the Windchill Server on your client machine - this be looked into also. If the client machine is not also located in the same domain.local domain as the windchill server, then you may need to add this domain to the DNS search scope of the client - this is in the TCP v4 Internet Settings / Advanced / DNS tab of the client machine.
Hope that helps
Rgds
Gary