general-commands

Print Java command line arguments
java -XX:+PrintCommandLineFlags -version
 
Check TLS Version

nmap --script ssl-enum-ciphers -p 8443 t3377-qaas2.do.devshn.net
openssl s_client -connect t3377-qaas2.do.devshn.net:8443 -tls1_2
sslscan --show-cipher-ids t10203-qat.do.devshn.net:844


Check the process on a port
Linux: lsof -nP -iTCP:8443 | grep LISTEN
Windows: Get-Process -Id (Get-NetTCPConnection -LocalPort portNumber).OwningProcess

Check EC2 Machine information
curl -s http://169.254.169.254/latest/dynamic/instance-identity/document

Check connectivity
Linux: nc -zv <host> <port>
Windows: New-Object System.Net.Sockets.TcpClient("www.myshn.net", 443)

Check public IP of a node
dig +short myip.opendns.com @resolver1.opendns.com
 
View file permissions in Octal format
stat -c '%A %a %n' *

Certificate Commands

 
1. To View CSR Entries
 
openssl req -text -noout -verify -in domain.csr
 
2. To View certificate information
openssl x509 -text -noout -in domain.crt
 
3. Using keytool to view information of a certificate
keytool -printcert -file domain.crt
 
4. View Keystore entries
keytool -list -v -keystore keystore.jks