For faster initial connection times, Tramp stores previous
connection properties in a file specified by the user option
The default file name for
Tramp reads this file during Emacs startup, and writes to it when exiting Emacs. Delete this file for Tramp to recreate a new one on next Emacs startup.
nil to disable
storing connections persistently.
When Tramp detects a change in the operating system version in a remote host (via the command uname -sr), it flushes all connection related information for that host and creates a new entry.