UpdateCenter FileNotFound after switching to a new Webhosting - any ideas ?

We switched our webhosting to a new vendor. The UpdateCenter is now showing a nasty error like "There were some problems while storing Establishing a connection ..." with a cause pointing to one of my *.nbm files.

No code from my side was changed so it has to be in the webhosting.

Debugging tells me:

java.io.FileNotFoundException: http://<our-website_url>/update/xyz.nbm
        at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1434)

Also when copy&paste manually the URL into a browser I get a 404 - File not found html error. 

Copy&[aste the URL to the Download window of fx firefox does correclty download the file - so the file IS present on the website. 

Accessing any other files than *.nbm like the updates.xml works fine.



Any expert around who could tell me what the webhosting company might do to prevent my NetBeans app to download *.nbm files ? They tell me "all is normal" which of course it is not. 

Thanx in advance. I know this is really not a NetBeans error but maybe some have run into this issue while working on their UpdateCenter and can give me a hint towards the right direction what to tell the webhosting company.

Bernd