I'm experiencing the following problem with Microsoft's Enterprise Manager:
When trying to open a package to edit it I get an error stating that the Server does not exists. However people connecting from another computer can use Enterprise Manager to open packages.
When I try to create a connection within a new package and I specify the server's name I get the same error however using 127.0.0.1 or localhost I do not get this error.
Because 127.0.0.1 and (localhost) work fine, it would appear that your problem lies with WINS and/or DNS. My first guess would be a problem in your lmhosts file (on your machine), probably an incorrect entry for the machine itself.
Try to ping your own machine (substituting you machine name instead of myhost) using: