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Hopefully some TAMBers can suggest something here as I have run out of options. I often work from home when not in my London office. I access my office's network through NCP which is a secure VPN my work use. My ISP is BT Broadband and for the past 2 years I have had no problems. However on Wed an error message I got on NCP/VPN was translated from my work IT people as port 4500 (secure port) on my router being blocked or filtered and thus meaning my home workstation was unable to receive encrypted info from my office network. My office are in no doubt this is the issue and it would seem to be confirmed as I could log on through NCP by using my neighbours ISP. My dealings over two days or so with BT have been horrendous - call centre staff in India who manfully try and help but are clearly not equipped to deal with such queries. I had to sign up to an extra £10 a month on my BT subscription to get access to a technical team of engineers who essentially confirmed that no ports are blocked. They did remotely access by home computer and did something around the ports on the router but am not sure what. The upshot is my BT broadband works fine but I am still getting the same error message and my work IT team Maintain it still to do with a problem with router port 4500. Hope this all makes sense - can anyone suggest what I can do or what I can ask BT to do? I've done the usual switching on and off in attempting to reboot back to original settings but still not working. In trying to work out what has changedI cinsid that I have no ability or knowledge to intentionally make any changes to settings or download a firewall (onto my home Mac) which may have altered any settings. Even if I downloaded something unintentionally BT would have picked up on it when accessing my home computer remotely. Essentially BT are saying there are no problems with the port but something has clearly changed in the space of a week. I would change provider (although I am wondering if I would lose my annual advance payment of line rental to BT) if it would guarantee it would fix it and the fact my NCP/VPN works with next doors ISP suggests it would work with a new ISP and therefore new router settings. However I am concerned I go through the hassle and time of changing ISPs only to find the problem remains and it is say a legacy issue connected to the line. As you can probably tell I am not particularly strong in this field and have tried to best undestand the information relayed to me. Does anyone think they know what the problem is and/or better still, know what I can do to fix it? Many thanks.