WordPress 3.1.2 Network Enabled non-www to www

Where are you trying to do the force redirect? I think the best place for this may be in a .htaccess file. Something like 

RewriteEngine on
RewriteCond %{HTTP_HOST} !^www.your_domain.com$
RewriteRule ^(.*)$ http://www.your_domain.com/$1 [R=301]

Related Posts:

  1. add_rewrite_rule: $matches var not replaced by captured value
  2. Custom permalinks with NextGEN Gallery
  3. How to change default page slug?
  4. Will references to ugly links automatically redirect to their pretty url permalink?
  5. How do I add a add_rewrite_rule without it redirecting?
  6. WP Login forms action URLs displayed as pretty URLs in browser (ex with Restore Password)
  7. Sub domain redirection to taxonomy
  8. WordPress Network on IIS7/SQL Server – Rewrite Issues
  9. Redirecting all old links from previous EE site to new WP site in one go?
  10. Server (WordPress) redirects files that are not supposed to (using htaccess)
  11. Rewrite WordPress Custom URL
  12. WordPress removes spaces in URL on pagination
  13. Custom rewrite rule
  14. Home page with Polylang redirects to other page [closed]
  15. expecting 404 but redirecting to post with url subdirectory in post title
  16. Alias ‘wp-content’ directory to something shorter (framework?)
  17. Is there a ‘rake routes’ for wordpress?
  18. Remove Query String from URL on Redirect – Redirection Plugin
  19. How to disable the default WordPress redirect to non-www URLs?
  20. How to change the main site url on a multisite installation (network)?
  21. add_rewrite_rule fro html to another url not working
  22. Double domain name in category URL-s
  23. WordPress redirects non-existing url to existing ones – how to disable
  24. Rewrite Preview URL to include index.php
  25. How to disable URL rewriting for specific URLs?
  26. How to configure Multisite Network with randomized hostnames?
  27. Can I change default registration link (without htaccess)?
  28. How do I display only the parent page in the url
  29. How to remove wordpress directory slash
  30. Wildcard forward all posts and pages with few exceptions
  31. Redirect HTTP to HTTPS for all sub domains (blog posts)
  32. How to redirect large amount of URLs?
  33. Redirecting /px/?q=x to /px/x/
  34. URL redirect on updating the post date
  35. How to redirect a link to a new link?
  36. ReWrite rule for files of a previously standalone blog moved to network
  37. Rewrite vs Redirect from ?p={ID}
  38. 301 Redirect all posts urls from .html to / (without .html)
  39. Is WordPress API visible from PHP file called in htaccess
  40. Re-directing URLs with dates to URLs without dates
  41. Redirect htaccess [closed]
  42. How to redirect Webp files?
  43. 301 Rewriting htaccess
  44. 404 redirect based on url
  45. How to Force WWW. in Domain With WordPress MU Domain Mapping Plugin?
  46. How are rewrite rules applied in WordPress?
  47. Redirect to new domain that serves new and different content
  48. Redirect users with “.” (dot) in their username and replace with “-” (dash) to correct profile
  49. Redirect empty search to another page
  50. i want to change URL of WordPress image or rewrite in runtime
  51. Remove part from dynamic url and redirect
  52. Fresh install redirects to www, breaking page loads
  53. Broken page redirect
  54. Make URL like /fr/something display same as /something
  55. Remove trailing slash
  56. taxonomy term in URL slug won’t forward to the correct term for custom post like it does for default categories/normal posts
  57. Error 404 wordpress redirecting URL
  58. How to create short urls for sharing and downloadable content?
  59. Redirect A URL Pattern In WordPress Using .htaccess
  60. URLs ending with number higher than 2147483647 redirects to to domain.com/2147483647
  61. Migration from old CMS to WordPress 301 redirection rules?
  62. Changes done to .htaccess are not getting reverted back
  63. WordPress 3.0 Multisite – Child sites and backends appearing blank
  64. How to change search url produced by ‘s GET method?
  65. Using .htaccess to redirect /da/ to / in URL
  66. Preventing index.php?category_name=something from redirecting
  67. Rewrite Rules for Multiple (more than 2) Taxonomies
  68. Using plus (+) sign instead of space (-) in WordPress URL
  69. SEO Friendly URLs for my plugin categories
  70. How to create a specific frontend URL (not a Page) from a theme or plugin?
  71. WordPress keeps writing rewrite rules to .htaccess
  72. Multilingual theme: Changing locale based on URL
  73. Custom rewrite rule for backend/admin?
  74. Remove all categories from URL
  75. Add specific word to default page permalink
  76. How to Redirect login User with Mapped Domiain Primary blog Url to Original Sub-site Url
  77. Is it possible to generate an alternate structure for multi-tag urls?
  78. Use single-site install and map entities to subdomains
  79. How do I change attachment slug from name to id
  80. https redirect hell (adding www)
  81. Redirect subdomain in Multisite installation?
  82. How do I only allow downloads that are referred from my domain?
  83. How to change custom post type slug
  84. Retrieve query var within functions.php
  85. rewrite rule generated with mpdf to a shorter version
  86. Name page template properly
  87. One off rewrite for single post-type slug (show normal page with same URL instead)
  88. .htm re-write is adding an ending / to my URL bar
  89. database not responding on localhost
  90. loading images, css and fonts from site url
  91. How to Update / Change URL when Popup Modal Loads?
  92. How wordpress core include search.php with $_GET[‘s’]?
  93. Routing in WordPress
  94. Stop wordpress from prettify URL
  95. how to change some of the rules in the database
  96. WordPress permalink still not working (error or not understood?)
  97. Pagination posts. Url format
  98. how rewrite is working in wordpress
  99. How to prevent URL-modification when page title contains digits only?
  100. Rewrite rule to simulate page hierarchy results in 404