I looked at some prior support posts for Vanco and a session ID error may indicate that there is a problem with the credentials that are in use.
1) Are you trying to accept live payments or are you in testing/debug mode? You can check through Event Espresso –> Payment Methods –> Vanco and then look for the debug option.
2) Does your website have an SSL certificate on it? For example, browsing to an HTTPS page on your site should work (e.g. https://example.com/events/)
I’ll send you another email with a specific error message from your server’s logs that you can forward to Vanco. Their error messages are indicating that your IP is being blocked by Vanco.
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