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I'm having some trouble creating a urlacl reservation in Windows Server 2008; probably this a rookie mistake.

The command line I'm using is:

netsh http add urlacl url=http://+:99898/ user=ben

The error that I see is:

Url reservation add failed, Error: 87
The parameter is incorrect.

There is a local user account named 'ben' that has admin privileges. I've made sure to put a trailing slash after the port number in the URL. Google and MSDN documentation are letting me down now - does anyone have any clue what I'm doing incorrectly?

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Did this question make anybody think of TV crime shows with "IP addresses" like "10.68.342.12" in them? >smile< – Evan Anderson Jun 23 '11 at 3:40
I'll take my lumps here... =) – Ben Jun 23 '11 at 4:44
up vote 7 down vote accepted

Port number "99898" isn't a valid TCP port number. TCP port numbers are 16-bit unsigned integers, so they can't exceed 65535. I would strongly suspect that this invalid port number is the reason for the error you're seeing.

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That's it - I tried with a 4-digit port number earlier, but must have gotten a different error. Thanks! – Ben Jun 23 '11 at 0:21

I had the same error; in my case, the mistake I was making was omitting the trailing slash from the URL:

C:\>netsh http add urlacl url=http://+:8085 user=DOMAIN\myname
Url reservation add failed, Error: 87
The parameter is incorrect.

C:\>netsh http add urlacl url=http://+:8085/ user=DOMAIN\myname
URL reservation successfully added
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And in my case, I had omitted the url= and user=, which the documentation says are optional, but are apparently not. – Cameron Jun 2 at 15:32

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