CANNOT access via http://localhost but CAN access via http://computername or DNS from the internet

Question

So...

'http://server_ip_address/application' works locally

'http://dns_address/application' works locally

'http://computer_name/application' works locally

'http://localhost/application' does not work locally

Any ideas on getting localhost to work again? It does work for the browsing the root however.

This is IIS 7.5 and ASP.NET MVC 2 running in classic mode.

what is output of "ping localhost"

Zimbabao
– Zimbabao

2011-03-07 18:17:43 +00:00
Commented Mar 7, 2011 at 18:17 — Zimbabao
– Zimbabao, Commented Mar 7, 2011 at 18:17

Mike Cheel · Accepted Answer · 2011-03-07 19:02:32Z

4

This is happening because I am only allowing SSL for the application which is enforced by a redirect mechanism to the SSL page AND the SSL only listens on the correct port.

Thanks for the help guys, I really appreciate it.

answered Mar 7, 2011 at 19:02

Mike Cheel

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Mark Berry · Accepted Answer · 2019-08-31 20:47:21Z

4

open this file c:\windows\system32\drivers\etc\hosts with the notepad and add the lines

127.0.0.1       localhost

if it is commented (default, line start with ;) then uncomment it.

and try it again.

bad: (ipv6 problem)

C:\Users\Administrator.DEVJC>ping localhost

Pinging DEVJC.vaio.cl [::1] with 32 bytes of data:
Reply from ::1: time<1ms

Ping statistics for ::1:
    Packets: Sent = 1, Received = 1, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
     Minimum = 0ms, Maximum = 0ms, Average = 0ms
Control-C

good: (ipv6 and ipv4 compatible)

C:\Users\Administrator.DEVJC>ping localhost

Pinging DEVJC.vaio.cl [127.0.0.1] with 32 bytes of data:
Reply from 127.0.0.1: bytes=32 time<1ms TTL=128
Reply from 127.0.0.1: bytes=32 time<1ms TTL=128

Ping statistics for 127.0.0.1:
    Packets: Sent = 2, Received = 2, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 0ms, Maximum = 0ms, Average = 0ms
Control-C

Microsoft says "# localhost name resolution is handled within DNS itself." but it is a lie (an half-lie). Sometimes is true but in a few cases it fail (or it try to resolve externally = slow)

edited Aug 31, 2019 at 20:47

Mark Berry

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answered Mar 7, 2011 at 18:25

magallanes

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2 Comments

Mike Cheel Over a year ago

I am beginning to think it is because of how the bindings are configured. You are right about the hosts part though as far as being commented out. I'm still trying to understand what is causing it.

Mark Berry Over a year ago

I'm not sure the default (with localhost commented out in hosts) is bad. Yes, ping localhost returns IPv6 results. But ping -4 localhost returns 127.0.0.1.

Sheshadrinath R · Accepted Answer · 2015-03-11 04:31:23Z

2

You can also resolve by adding the Binding information in your IIS. To do this:

Open IIS
Select Default Web site
On right side actions panel, select Bindings. You will get site bindings screen
Add a new binding adding 'localhost' in the Host name field
IP Addresses field can contain text 'All Unassigned'
Then save and reset IIS

After this I think you should be able to browse all applications hosted in your IIS with localhost.

answered Mar 11, 2015 at 4:31

Sheshadrinath R

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MSH · Accepted Answer · 2013-07-06 13:48:14Z

1

I found my problem , In my server I Have Microsoft Thread Management Gateway (Microsoft TMG) in the firewall policy there are "HTTP Protocol Policy" Right click it --> "Configure HTTP" --> "General" --> "URL Blocking" --> uncheck block high bit characters --> click OK then Apply

wait to TMG sync firewall. then go to your site and check your problem.

answered Jul 6, 2013 at 13:48

MSH

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