I have a web server running locally that's mapped to project.name.localhost:3011 on a MacOSX box. My /etc/hosts defines:

127.0.0.1 project.name.localhost

I need to browse to this server in Chrome and Firefox. Chrome works great when I visit <http://project.name.localhost:3011/>. Firefox gives an "Unable to connect" connect error. I can see in my local server's console that no connection attempt was even sent to the server when I try from FF.

This is on FF version 59.0.2 (64-bit). FF has no problem with public internet sites like this one, and google.

I've already tried all of the steps suggested here:
<https://support.mozilla.org/en-US/kb/firefox-cant-load-websites-other-browsers-can>
In summary, those steps are:

* Check proxy settings, verify proxy is turned off
* Set `network.dns.disableIPv6` to *true* in `about:config`
* Set `network.dns.disablePrefetch` to *true* in `about:config`
* Cleared *all* history, including cookies and cache

Also tried disabling HSTS as described here:
<https://support.mozilla.org/en-US/questions/1204380>

```
ping project.name.localhost

```

works just fine also. There is no local DNS issue.

<http://127.0.0.1:3011/> gives me the exact same error as using the hostname. However, I need to access the server via a hostname. It is not and should not be configured to respond on a direct IP.

How can I get FF to hit my local web server via a hostname?

EDIT: Two co-workers experienced what they describe as the same problem when they setup their systems, but they both said "it just went away on its own" after a day or two. My problem has persisted across weeks and reboots.

---

Console output from request:

```
GET http://global.appen.localhost:3011/invoice_groups

Request headers (398 B) 
Accept  
text/html,application/xhtml+xm…plication/xml;q=0.9,*/*;q=0.8
Accept-Encoding 
gzip, deflate
Accept-Language 
en-US,en;q=0.5
Cache-Control   
no-cache
Connection  
keep-alive
Host    
global.appen.localhost:3011
Pragma  
no-cache
Upgrade-Insecure-Requests   
1
User-Agent  
Mozilla/5.0 (Macintosh; Intel …) Gecko/20100101 Firefox/59.0

```

Network Timing:

```
Blocked:          → 1 ms
DNS resolution:                  → 1 ms

```