KB IssueIIS - Classic ASP Website gives 500 Internal Server Error
Issue Details
If not enough Response Buffer is available for all websites running in IIS, you may encounter the 500 internal server Error.
Recreate Issue
If you have one website with a high Response Buffer Limit and all other websites are set to the default 0, the pages will not have enough response buffer, and the dreaded 500 Internal Server Error will occur.
Resolve Issue
  1. Open IIS
  2. Select the Server Instance
  3. Under IIS on the Right-side Panel.
  4. Double-click [ASP]
  5. Click the arrow to expand [Limits Properties]
  6. For [Response Buffering Limit], change from 0 to 4194304
  7. Click on the [Apply] on the top-right under [Actions]
  8. Select the Server Instance, and choose [Restart]
  9. Now, load the website.