It's probably a mod_security thing that's triggering the 406 error due to a somewhat malformed URL ... the error message doesn't have a variable assigned to it.
I gather you're using PayPal Website Payments Pro in this case, since you posted in this section of the forum.
You have a couple options:
edit /includes/modules/payment/paypaldp.php
a) around line 363 you'll see a line like this:zen_redirect(zen_href_link(FILENAME_CHECKOUT_PAYMENT, [B]$error[/B], 'SSL', true, false));Change it to this:```
zen_redirect(zen_href_link(FILENAME_CHECKOUT_PAYMENT, [B]'error=' . $error[/B], 'SSL', true, false));
or b) change it to this:```
zen_redirect(zen_href_link(FILENAME_CHECKOUT_PAYMENT, [B]''[/B], 'SSL', true, false));
The first option will correctly form the URL with the error message. The second skips the error message from the URL altogether, allowing the message to simply happen by the built-in messageStack.
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