# An issue regarding http://localhost/3000/

**URL:** <https://www.ruby-forum.com/t/an-issue-regarding-http-localhost-3000/148506>\
**Category:** Rails\
**Created:** [September 13, 2008, 8:36pm UTC](https://www.ruby-forum.com/t/an-issue-regarding-http-localhost-3000/148506 "2008-09-13T20:36:27Z")\
**Posts on this page:** 4\
**Page:** 1

<div class="post-metadata">

**Author:** ![Warrenk](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/w/b38774/32.png) [@Warrenk](https://www.ruby-forum.com/u/Warrenk)\
**Post date:** [September 13, 2008, 8:36pm UTC](https://www.ruby-forum.com/t/an-issue-regarding-http-localhost-3000/148506/1 "2008-09-13T20:36:27Z")

</div>

I am new to the Ruby on Rails programming system and I just purchased  
Railspace but I cannot pull up this URL needed to progress further  
through the book, It is telling me it is an invalid URL, what should I  
do?

---

<div class="post-metadata">

**Author:** ![Warrenk](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/w/b38774/32.png) [@Warrenk](https://www.ruby-forum.com/u/Warrenk)\
**Post date:** [September 13, 2008, 8:46pm UTC](https://www.ruby-forum.com/t/an-issue-regarding-http-localhost-3000/148506/2 "2008-09-13T20:46:23Z")

</div>

I believe you have the address wrong. Shouldn’t it be a colon (🙂  
instead of a slash (/) between localhost and 3000?  
i.e.: [http://localhost:3000/](http://localhost:3000/)

Pepe

---

<div class="post-metadata">

**Author:** ![Warrenk](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/w/b38774/32.png) [@Warrenk](https://www.ruby-forum.com/u/Warrenk)\
**Post date:** [September 13, 2008, 8:48pm UTC](https://www.ruby-forum.com/t/an-issue-regarding-http-localhost-3000/148506/3 "2008-09-13T20:48:09Z")

</div>

Warren,

It is -

[http://localhost:3000](http://localhost:3000)

That’s a colon, not a slash : 3000 is the port on which Rails is  
listening.

Phil

On Saturday 13 September 2008 18:11:34 Warrenk wrote:

> I am new to the Ruby on Rails programming system and I just purchased  
> Railspace but I cannot pull up this URL needed to progress further  
> through the book, It is telling me it is an invalid URL, what should I  
> do?

–  
Philip N.  
ScotDB Limited  
(removed\_email\_address@domain.invalid)

---

<div class="post-metadata">

**Author:** ![Warrenk](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/w/b38774/32.png) [@Warrenk](https://www.ruby-forum.com/u/Warrenk)\
**Post date:** [September 13, 2008, 9:10pm UTC](https://www.ruby-forum.com/t/an-issue-regarding-http-localhost-3000/148506/4 "2008-09-13T21:10:22Z")

</div>

Warrenk wrote:

> I am new to the Ruby on Rails programming system and I just purchased  
> Railspace but I cannot pull up this URL needed to progress further  
> through the book, It is telling me it is an invalid URL, what should I  
> do?

You meant [http://localhost:3000/](http://localhost:3000/) with a colon, right?

The colon introduces the port number, which is :80 by default. Websites  
in a  
development mode typically run on a port higher than some number, such  
as 1024,  
because these ports have different security issues, and are up for  
grabs.