HTTP Reputed Error Codes

      The following are the reputedly facing HTTP  error codes.

Error Code	Error Message	Error Description
400	Bad Request	The Request sent from the browser could not be understand by server
401	Unauthorized	Wrong Username and Password
403	Forbidden/Access Denied	The server refused to serve the page. IP restriction and Modsecurity blocking are possible reasons
404	Page Not Found	The request page is not available in the server
502	Proxy Server time out	Response from Backend application will take more time. Can see in Apache logs
503	Service unavailable	Backend application server instance may be down. Can see in Apache logs

OpenSSL Frequently Used Commands

1. Generate SSL Private key with passphrase
     #openssl genrsa -des3 -out server.key 1024

2. Generate SSL Private key without passphrase
     #openssl genrsa -out server.key 2048

3. Generate a CSR (Certificate Signing Request)
     #openssl req -new -key server.key -out server.csr

4. Check Open-ssl Version
     #openssl version -d  , openssl version -a
 

5. Check Key Password confirmation
     #openssl rsa -in xxxxxxxx.com.key.pem -out server.key

6. View certificate Details of pem File use the Below Command
     #openssl x509 -text -in xxxxxx.pem

7. Generate The Open-ssl with Version 3
     #openssl x509 -req -days 365 -in domain.com.csr.pem -extfile /etc/pki/tls/openssl.cnf -extensions v3_ca -signkey domain.com.key.pem -out domain.com.crt.pem

8. Remove Passphrase from Key
     #cp server.key server.key.org
     #openssl rsa -in server.key.org -out server.key

9. Set new passpharse
     # openssl rsa -des3 -in server.key -out server.key.new
     # mv server.key.new server.key

10. Generating a Self-Signed Certificate
     #openssl x509 -req -days 365 -in server.csr -signkey server.key -out server.crt

11. View the certificate Information
     #openssl x509 -noout -fingerprint -text < server.cert > host.info

12. View who issued the cert?
     #openssl x509 -noout -in cert.pem -issuer

13. View to whom was it issued
     #openssl x509 -noout -in cert.pem -subject

14. View the valid date of the certificate
     #openssl x509 -noout -in cert.pem -dates

15. Generating P12 Certificate for Tomcat
     #/usr/sfw/bin/openssl pkcs12 -export -in public-cert.pem -inkey private-key.pem -out my_pkcs12.p12

16. View PKCS12 cert
     #openssl pkcs12 -info -nodes -in <cert.p12>

17. Generate the key and CSR with SHA1 method
     #openssl genrsa -des3 -out server.key.pem 2048
     #openssl req -new -sha1 -key server.com.key.pem -out server.csr.pem

18. Converting the certificate in .cer format to .pem format
     #openssl x509 -inform der -in servercert.cer -out servercert.pem

19. Mergring and converting Server Private key, Server Certificate and CA certificate into PKCS#12 format
     #openssl pkcs12 -export -in servercert.pem -inkey  serverprivatekey.pem -name "MY CERTIFICATE" -certfile cacert.pem -out mycert.p12