Magento not saving product edits and redirects to dashboard?

[moccc]

When I try to edit an existing product on Magento, After hitting "Save and continue edit" button , It does not save anything at all and just goes to admin dashboard .
So I checked the "Network" tab in inspect element of Chrome browser and saw this error :

Here is the highlighted file (prototype.js) lines containing 1739 :

    try {
  var response = new Ajax.Response(this);
  if (this.options.onCreate) this.options.onCreate(response);
  Ajax.Responders.dispatch('onCreate', this, response);

  this.transport.open(this.method.toUpperCase(), this.url,
    this.options.asynchronous);

  if (this.options.asynchronous) this.respondToReadyState.bind(this).defer(1);

  this.transport.onreadystatechange = this.onStateChange.bind(this);
  this.setRequestHeaders();

  this.body = this.method == 'post' ? (this.options.postBody || params) : null;
/* line 1739 */  this.transport.send(this.body);

  /* Force Firefox to handle ready state 4 for synchronous requests */
  if (!this.options.asynchronous && this.transport.overrideMimeType)
    this.onStateChange();

}

So how can I fix this problem ? What's wrong with this ?

[Pronto]

Your problem is not with Prototype, but with "403 (Forbidden)". There's probably some kind of web server directive that makes ajax request fail.

[babusourav]

I have the same problem, I am using magento 1.9.1. It was running and working fine but before 2 days i fetch the issue Plz anyone give the solution. I am sure it is not the server issue.

[shajitha_banu]

Did anyone got solutions for this?. Please help me if so

[netstepinc]

Did you find a solution to this?
I inherited a Mag 1.9 site that I have to keep running for a few months until it can be replaced.

Something has changed from last week and now

Products and customers > save and continue > no save and redirect to dashboard.

POST
https://www.example.com/store/index.php/admin/admin/customer/save/back/edit/tab/customer_info_tabs_c...
HTTP/1.1 302 Moved Temporarily