Verify expiry date of SSL Certificate using OpenSSL

Connect to the server using s_client and download the certificate to cert.txt
openssl s_client -connect server:port > cert.txt

Verify the expiry date from the downloaded certificate
openssl x509 -in cert.txt -noout -enddate 

Speed up SSH connections using ControlMaster

It is possible to speed up ssh connections from the same host by using ControlMaster. What we need is establish a ControlMaster connection to the host and all the subsequent connection from the same host will be allowed with out prompting for passwords.

The configuration required is simple. Just create a file ~/.ssh/config and add the contents provided below.

vi ~/.ssh/config

Host *
ControlPath ~/.ssh/master-%r@%h:%p
ControlMaster auto


For more information refer man page

man 5 ssh_config