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ERROR: Unable to verify $_POST vars

Home Forums Community Forum ERROR: Unable to verify $_POST vars

This topic contains 1 reply, has 2 voices. Last updated by  ryannagy 4 years, 11 months ago.

Topic Author Topic
Posted: Monday Feb 6th, 2012 at 11:49 pm #4243
MicroEd Web
Username: microed

Well this is frustrating, now my 3rd post trying to get help with this issue. But I will post it again.

Here is what I have tried to fix it. We are just using regular PayPal buttons.

– Enabled logging so I can see what is happening, it happens for every transaction.
– cUrl isn’t available so it falls back to fopen, which is available. (see below)
– I force www. on the domain with mod_rewrite
– I also use ‘php_value allow_url_fopen On’ in the .htaccess
– I have re-entered the PDT token from PayPal…
– Asked the server about the error, and they are hesitant to help because its a WP Plugin.

After speaking with the server they think it might be related to open_basedir restrictions, and that cUrl is available. Could this be the case or are we looking in the wrong areas?

Here is an example of the log.

PHP v5.2.17-pl0-gentoo :: WordPress® v3.3 :: s2Member® v111220
Memory 22.54 MB :: Real Memory 22.75 MB :: Peak Memory 22.69 MB :: Real Peak Memory 22.75 MB
User-Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:12.0a1) Gecko/20120123 Firefox/12.0a1
array (
‘subscr_gateway’ => ‘paypal’,
‘s2member_log’ =>
array (
0 => ‘Test preview of Return Page `proxy_use`: ( `x_preview` ).’,
1 => ‘Redirecting Customer to the Home Page. Test preview of Return Page `proxy_use`: ( `x_preview` ).’,
‘s2member_paypal_proxy’ => ‘paypal’,
‘s2member_paypal_proxy_use’ => ‘x-preview’,

PHP v5.2.17-pl0-gentoo :: WordPress® v3.3 :: s2Member® v111220
Memory 22.28 MB :: Real Memory 22.50 MB :: Peak Memory 22.41 MB :: Real Peak Memory 22.50 MB
User-Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; GTB7.2; .NET CLR 2.0.50727; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729; AskTbORJ/
array (
‘s2member_log’ =>
array (
0 => ‘Unable to verify $_POST vars. This is most likely related to an invalid configuration of s2Member, or a problem with server compatibility.’,
1 => ‘If you’re absolutely SURE that your configuration is valid, you may want to run some tests on your server, just to be sure $_POST variables are populated, and that your server is able to connect/communicate with your Payment Gateway over an HTTPS connection.’,
2 => ‘s2Member uses the `WP_Http` class for remote connections; which will try to use `cURL` first, and then fall back on the `FOPEN` method when `cURL` is not available. On a Windows® server, you may have to disable your `cURL` extension; and instead, set `allow_url_fopen = yes` in your php.ini file. The `cURL` extension (usually) does NOT support SSL connections on a Windows® server.’,
3 => ‘Please see this thread: `` for details regarding the ideal server configuration for s2Member.’,
4 => ‘array (
‘s2member_paypal_return’ => ‘1’,
‘s2member_paypal_return_tra’ => ‘ENCODED’,
‘tx’ => ‘ENCODED’,
‘st’ => ‘Completed’,
‘amt’ => ‘3.00’,
‘cc’ => ‘AUD’,
‘cm’ => ‘’,
‘item_number’ => ”,
‘sig’ => ‘ENCODED’,
5 => ‘Redirecting Customer to the Home Page, due to an error that occurred.’,
‘s2member_paypal_return_tra’ => ‘ENCODED’,

  • This topic was modified 4 years, 11 months ago by  MicroEd Web.

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Posted: Wednesday Feb 8th, 2012 at 9:14 am #4451
Username: ryannagy

This just started happening to me on a new account though it has never happened before. I’m not even sure where to start.

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