I would like to add ssl certificate to my already existing wordpress site

  1. Yes it applies to your old articles.
  2. There are several specific issues related to images which use absolute urls (mixed content errors). Basically you need to inform plugin/theme authors to update their code or to update it yourself (which is not recommended because in case of update you will lose the changes.)

  3. Yes. After applying the certificate you need to check for mixed content errors and to fix them. They usually are connected to:

    • improper enqueueing of scripts and styles using absolute urls
    • using absolute urls in images, pages and etc.

Here is a good article on how to apply SSL certificate and how to handle mixed content errors. Remember to backup your website and database prior to applying the certificate!

Related Posts:

  1. What is .crt and .key files and how to generate them?
  2. NET::ERR_CERT_REVOKED in Chrome, when the certificate is not actually revoked
  3. https connection using CURL from command line
  4. “ssl module in Python is not available” when installing package with pip3
  5. How to generate a self-signed SSL certificate using OpenSSL?
  6. Convert .pem to .crt and .key
  7. Simple Java HTTPS server
  8. HTTPS connection Python
  9. Java: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
  10. CFNetwork SSLHandshake failed iOS 9
  11. What exactly is cacert.pem for?
  12. OpenSSL: unable to verify the first certificate for Experian URL
  13. ERR_SSL_CLIENT_AUTH_SIGNATURE_FAILED in Google Chrome
  14. How to disable cURL SSL certificate verification
  15. How do you sign a Certificate Signing Request with your Certification Authority?
  16. Java Keytool error after importing certificate , “keytool error: java.io.FileNotFoundException & Access Denied”
  17. Issues with installing python libraries on Windows : CondaHTTPError: HTTP 000 CONNECTION FAILED for url
  18. WordPress wp-admin https redirect loop
  19. Is it safe to use sslverify => true for with wp_remote_get/wp_remote_post
  20. Howto force SSL for all requests?
  21. Local version of a WordPress site – SSL/HTTPS enforced?
  22. Images causing Mixed Content with SSL
  23. bloginfo() and get_template_directory_uri() with SSL?
  24. Favicon causes mixed content warning over SSL
  25. After updating site to use SSL all images in posts point to http://
  26. Adding https to wordpress website
  27. What’s the right move with SSL for user based site?
  28. I am locked out of my WordPress site after changing site URL from Http to Https
  29. Enabling SSL on wordpress results in 404
  30. SSL setup: wp-login css doesn’t load over httpS
  31. In WP versions >= 4.0, is FORCE_SSL_LOGIN forcing HTTPS for the entire admin session?
  32. Separating HTTP and HTTPS content with WordPress, Varnish, and an SSL terminator?
  33. SSL Certificate and WordPress
  34. Pointing SSL Enabled URL at Single WordPress Page
  35. Occasional HTTPS Mixed Content Warning
  36. Google maps causing mixed content in header
  37. Cloudflare and SSL breaks wordpress – Mixed Content & Unable to use Admin
  38. XML asset fails to load using https
  39. Search and replace http:// links to https:// to get the green padlock
  40. I changed my site from HTTPS back to HTTP and now it is broken- Cannot access Admin panel on HTTP URL
  41. un-loading https
  42. WordPress site shows “File not found.” if opened through https
  43. How to set up HTTPS WordPress from Install Step?
  44. How do I set up a local version of my https wordpress site for testing and development using MAMP
  45. Address a single page to SSL https secure protocol?
  46. Certain header elements not served over https
  47. wordpress http to https windows server
  48. Jetpack “Connect to WordPress” serving insecure content under HTTPS
  49. Allow non-SSL pages to use https or Force non-SSL pages to http?
  50. Website access with http and https
  51. How to force non SSL on just one page?
  52. Need ideas for HTTPS multiple domain solution
  53. Redirect the whole blog to SSL but not the RSS feed (under Nginx)
  54. WordPress 4.0 Forces entire site into SSL
  55. How to control SSL in WordPress for automatically changing http to https?
  56. Site not reachable due to change from HTTP to HTTPS [closed]
  57. All content is HTTPS, but browsers warn of HTTP mixed content [closed]
  58. How to keep WP from using https to get to wordpress.org?
  59. How do I find non-SSL problems on my SSL page?
  60. SSL doesn’t work on certain pages – what is wrong?
  61. WordPress site shown as Not Secure on Chrome when SSL certificate is valid
  62. ERR_TOO_MANY_REDIRECTS on wordpress page [closed]
  63. Disable WordPress accessing WordPress.org to check for updates
  64. URLs not being output with https
  65. How to protect login via SSL but not the rest of the dashboard
  66. ERR_CONNECTION_REFUSED
  67. The REST API request failed due to an error. cURL error 60: SSL certificate problem: certificate has expired
  68. Do I install WordPress from my Cpanel on https or http, if my website has valid certificate?
  69. Website Migration (with https) to a new domain(http)
  70. How to move my local wordpress to https?
  71. Why does WordPress uses HTTPS for JS, CSS on EC2
  72. ERR_SSL_PROTOCOL_ERROR
  73. WordPress – SSL not working – browser console error “Mixed Content” and “Failed to load resource”
  74. Problem forcing San SSL certificate on WordPress
  75. SSL Certificate
  76. Front-end pages messed up due to HTTPS
  77. How to send user data from one website to another
  78. site on subdomain is redirecting to main site after installing wildcard ssl cert on both
  79. Forcing SSL (Bad Theme coding)
  80. How to switch static files back to using HTTP instead of HTTPS?
  81. WordPress Insecure Content
  82. SSL certificate breaks CSS (in combination with W3TC)
  83. I just updated my SSL certificate and now my site looses formatting when
  84. WordPress and SSL
  85. My WordPress site SSL is in red crossed color and can’t load at first time?
  86. SSL problems with WordPress
  87. SSL/HTTPS Redirect Loop
  88. The plain HTTP request was sent to HTTPS port in wordpress [closed]
  89. How to force static assets with HTTP sources to load over HTTPS?
  90. WordPress stuck at Step 1 of setup behind nginx reverse proxy
  91. Issue when site move from ssl domain to new domain without ssl
  92. Displaying a remote SSL certificate details using CLI tools
  93. how to download the ssl certificate from a website?
  94. What is a challenge password?
  95. Wildcard SSL certificate for second-level subdomain
  96. How do I clear Chrome’s SSL cache?
  97. Properly setting up a “default” nginx server for https
  98. Does each subdomain need it’s own SSL certificate?
  99. Generating a self-signed cert with openssl that works in Chrome 58
  100. wordpress is auto using http: not https: as it needs to because the server is http behind a reverse proxy https, how do I stop it?