We were wondering the same thing, after our nameserver records disappeared without explanation. After finally being able to get ahold of Network Solutions, it turns out that they turned off the domain for non-payment. Call me a bozo, but it's been my experience that one generally receives an invoice before being expected to make payment.
The closest thing that we got to an invoice was this mail:
Message-Id: <199904130925.FAA18772@ops.internic.net> Reply-To: firstname.lastname@example.org Precedence: Bulk X-MTS-Ticket: 990413.1e54 X-MTS-LoopDetect: InterNIC_Registration_Services From: email@example.com To: firstname.lastname@example.org Subject: [NIC-990413.1e54] Modify Registration INTERHACK.NET Date: Tue, 13 Apr 1999 05:25:43 -0400 (EDT) THIS IS NOT AN INVOICE, PLEASE DO NOT PAY UPON RECEIPT OF THIS NOTICE. YOUR BILLING CONTACT WILL RECEIVE AN INVOICE APPROXIMATELY 30 DAYS BEFORE YOUR RENEWAL PAYMENT IS DUE. The purpose of this notice is twofold; 1) to inform you that you will be invoiced for your annual maintenance fee shortly. 2) to give you an opportunity to update any information on your domain registration agreement. This notice is being sent to the Technical, Admin and Billing Contacts.
We followed the directions not to pay until receipt of an invoice. It is worth noting that we did move, so our snail mail address was out of date. (If sent by first class US mail, though, it should have forwarded to us.)
Then, Network Solutions, Inc., turns off our domain name on
a holiday, when they cannot be contacted. They didn't
WHOIS record for us to show that the
domain is "ON HOLD" as they used to do. So I have no idea
what's wrong and have to wait a whole day to get in touch with
someone there to find out what's happening. I finally get to
talk to someone, can make payment, and now have to wait
another 24 to 48 hours for the payment to be processed.
In the meantime, mail is bouncing and people can't reach the web site.
I am a very satisfied customer.
It got even better on the next day.