Heads Up :
The post you are writing will appear in a public forum. Please ensure all content is appropriate for public consumption. Review the employee guidelines for the community here.
Just ran into this scenario myself (can't login to ASDM, CAN login to SSH). I encountered this after an upgrade of both the ASA and ASDM. Given it had been working and assuming it wasn't an inherent problem with the new versions I'd loaded I started ...