Home / server / Questions / 340129
In Process
Cédric Boivin
Asked: 2011-12-13 07:25:22 +0800 CST

What is the maximum number of bindings on an IIS website

  • 772

How many bindings will IIS 7.5 support on one web site ?

To make sure my question is understand correctly.

  • I know i can put multiple website on the same server.
  • I know i can put multiple website on the same IP
  • I know i can put multiple binding on the same website

My questions is, it's there a limit of binding on the same web site.

Supose i get something like

  • www.serverfault.com
  • serverfault.com
  • m.serverfault.com
  • a.serverfault.com
  • b.serverfault.com etc..

On the same web site binding ....

windows-server-2008 iis-7 windows-server-2008-r2 bindings

3 Answers

  1. If you are using kernel-mode authentication, the limit is 64 bindings (Confirmed with Microsoft). I have tested it. It fails (401.2 error) if I add 65 or more bindings.

    I am not aware of any limitation if you use user-mode authentication.

    More information: IIS binding limit (401.2 Windows Authentication error)

    • 0

  2. In theory the maximum number of bindings per site is 65535 (the total number of ports available, period), minus, of course, any ports otherwise in use on the system (i.e. 25, 110, 3389, etc).

    Now, what you'd need with 65k ports bound to the same site is beyond me. Mailq's reference to the How Many Sites question may be more what you want to know.

    • -1

  3. I'd say that the limit to bindings should practically be dependant on how large applicationHost.config can be: MS reference

    • -1