It kind of depends on what you are seeing; On the CPE are you seeing the line in sync? Assuming you are, are you seeing authentication requests from the BRAS node? Again I assume yes.
If the CPE login attempt gets rejected and you're certain the login details are correct and you're not seeing their RADIUS servers querying yours to check the credentials then they have either provisioned the line with the wrong realm in the case its a 20CN line or if its a 21CN line the line might not be forwarded to your host-links (if its a 20CN line, they are typically locked to a specific realm specified during the provisioning process, and can support up to 5 realms per line, you can place a modify-order for free to add realms to the line, they usually happy the overnight within 24 hours, if its a 21CN line they are usually locked to the provider and accept any realm the CP has registered with BT, in this case you need to check you have registered the realm with BT). In either case you need to ensure you are advertising your RADIUS IPs etc and have configured their RADIUS servers as clients of yours although it sounds like you've done that. If your provider is not BT for example, and say a VAR or reseller of BT for example, it's possible BT haven't added your realm to the line because your reseller hasn't asked them to, or they have asked them to and so BT haven't done it, or your realm is on that line and the reseller isn't forwarding the realm correctly to you, and so on and so forth. In this case it’s another layer of complexity/faults. If you are taking tunnels from an LLU provider like TalkTalk for example most of the shame shiz applies. In order to check what realms you have provisioned with that ADSL circuit provider, be it BT, TalkTalk or a reseller (having worked with all combinations) - BT and TalkTalk only provide a list of realms via email (unless TalkTalk have updated their portal from the 90’s, BT don’t really even have a “portal”, naturally). I've only seen resellers allowing you to see your domains registered with them in realm time via a portal - but that isn't showing you necessarily that the reseller has provisioned the realm with their LLU supplier. James.
