If you see Access denied on our site, our security firewall has probably blocked your internet connection. It happens automatically, usually after repeated failed sign-ins — it doesn't mean anything is wrong with your computer.
Quick check: try our site on your phone using cell data instead of Wi-Fi. If it loads, your home connection is the one being blocked.
Two things to try:
Restart your modem. Unplug it, wait two or three minutes, plug it back in. This usually assigns you a new address and clears the block.
Contact us and we'll unblock you. Email support@costbook.com or call 1-800-829-8123.