I would keep working on Bostream. If it is a routing problem, even if it is with the higher tier provider they connect to, Bostream should be able to solve it. If it is with a US provider, Bostream should contact their provider's technical support as the "Customer" and have the "Routing Problem" corrected. I would not settle for the answer "There is nothing we can do". IMHO, you should escalate this issue to a higher level at Bostream. In the past at work, I have had similar issues with ISP's. Problems that have to be on my end or issues that are not my ISP's problem seem to be magically corrected once I have escalated the issue to the appropriate support resource.

Finally - I now know the cause of the problem!After several phone calls to customer support of my ISP (Bostream) during the last couple of weeks, they have now confirmed that the problem is caused by a faulty "bogus filter" at C I Host (the company hosting Precision Manuals' web site). C I Host is currently blocking the IP adresses of Bostream's customers from reaching their servers. I was told that the person responsible for routing at Bostream has contacted C I Host with a request to correct the problem.Hopefully, C I Host will update their filters and the problem will be solved soon.Maybe someone from Precision Manuals could put a little pressure on C I Host too? Currently, there are about 100000 potential customers not being able to reach you ;-)