It was a problem after upgrade from 2003 to MOSS, MySite link go nowhere, but I can still access my site s under /personal/username. So I install new SSP with web application for mysites and move the personal sites where.
My site move from one web application to another, batch for moving:
stsadm -o backup -url http://sps.arcweb.com/personal/%1 -filename c:\temp\%1
stsadm -o restore -url http://arcmysites.arcweb.com/personal/%1 -filename c:\temp\%1
stsadm -o deletesite -url http://sps.arcweb.com/personal/%1
there is %1 a user name.
After that deleted old portal (I did not have anything imortant on the portal) and creted a new portal. MySites link became OK.