The default is yes which automatically remembers the primary Windchill server. But if this option has been toggled off, this could cause your problem.
Please write back and let us know if this helped or not.
This issue stems from interaction between Creo 2 and Toolkit functions. OOTB Creo 2 creates a 'active_server_config.fld' file. If you have any protk options in your config.pro then Creo 2 creates the 'config.fld' file the first time you registerthe WC10 server. The very next time you launch Creo 2 with a protk option another file called 'do_not_remember_server.fld' is created and Creo 2 will not connect to WC.
We havecase 10895855opened and there is areference to PTC article CS61022.
Our workaround was to look for that "do_not_remember'file at launch and then either Rename or Delete.