Hi All,

I wasa successfully using a sandbox account to test a new website payment solution. Up until a few days ago sandbox transactions were being successfully sent and responses successfully received. If I change the post to url and API credentials from https://test.authorize.net/gateway/transact.dll to https://secure.authorize.net/gateway/transact.dll the transaction is accepted and a valid response is returned. The error I get when posting to https://test.authorize.net/gateway/transact.dll is:

msxml3.dll error '800c0008'

System error: -2146697208.

so sandbox fails, same transaction data posted to LIVE account is accepted. Tried other methods of posting to sandbox with no luck but each method I tried successfully posts to the LIVE url.

Any ideas why it used to work then stopped ? And why same code works for LIVE but not sandbox ?

Thanks !