tls-hostmismatch

tls-hostmismatch is a variable defined in `tls.el'.
Its value is

"# The hostname in the certificate does NOT match"

Documentation:
Regular expression indicating a host name mismatch in certificate.
When the host name specified in the certificate doesn't match the
name of the host you are connecting to, gnutls-cli issues a
warning to this effect. There is no such feature in openssl. Set
this to nil if you want to ignore host name mismatches.

You can customize this variable.

This variable was introduced, or its default value was changed, in version 23.1 of Emacs.