HTTP error 405 
Author: Luke F.
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My online appointment booking form has stopped working out of nowhere. when I try to use it I get this HTTP error; HTTP Error 405 - The HTTP verb used to access this page is not allowed. Internet Information Services (IIS) Is this a common problem and is there a fix?
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405 errors often arise with the POST method. You may be trying to introduce some kind of input form on the Web site, but not all ISPs allow the POST method necessary to process the form.
All 405 errors can be traced to configuration of the Web server and security governing access to the content of the Web site, so should easily be explained by your ISP
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Thanks for the reply.
I have been using the same server and ISP for the last three years with the same online booking form. Do you think that my ISP has changed something? If I were to call them what should I ask?
Hello Luke,
The ISP Probably changed something. I would ask if the changed something in the PHP support or the PHP mail() Function since you get the error 405.
Many thanks!