[Cialug] TLS Cert validity?

[L. V. Lammert]

We took over a system recently that appears to use a self-signed 
certificate for TLS, and it appears that it actually expired over a year ago!

 > Does TLS not care if the cert has expired? Have not seen any email 
failures related to TLS.
 > Is it common practice to run TLA with self-signed certs?
 > If so, any special process for installation?

I have created a self-signed cert for a web site in the past with a 
multi-year expiration, but that uses a .csr./key/.crt, .. in this 
case, the self-signed cert is a .pem. Does TLS do things differently 
than standard SSL?

	TIA for any enlightenment,

	Lee