Question

Running this code as a regular user throws HttpListenerException (access denied). Snippet runs ok as an administator

class Program {     static void Main(string[] args)     {         HttpListener listener = new HttpListener();         listener.Prefixes.Add('http://myip:8080/app/');         listener.Start();         //.... and so on      } } 

i went ahead and added the uri using netsh (netsh http show lists the uri)

netsh http add urlacl url=http://+:8080/app user=domain\user 

still getting the same error. Adding ACLs did work for other projects (they didn’t use HttpListener though). I tried multiple port/application name combinations, nothing works.

Any ideas what might be the cause?

Running .Net 3.5 SP1 on Vista

Answer 1

I do not understand why but here it is. It seems that the cause is that my network card is configured with 2 IPs.

if in the code i specify one of the ips (like i did in question above)

listener.Prefixes.Add('http://myip1:8080/app/'); 

then to avoid exception i need to register it with IP-bound weak wildcard

netsh http add urlacl url=http://myip1:8080/app user=domain\user 

however if i add prefix with the strong wildcard (plus sign)

listener.Prefixes.Add('http://+:8080/app/'); 

and register with the same wild card

netsh http add urlacl url=http://+:8080/app user=domain\user 

then there is no error and i can access my app from both ip.