# 4.0 upgrade - Browser access failure with DNS name but IP works
**URL:** https://community.graylog.org/t/4-0-upgrade-browser-access-failure-with-dns-name-but-ip-works/17957
**Category:** Graylog Central (peer support)
**Created:** [November 24, 2020, 1:31pm UTC](https://community.graylog.org/t/4-0-upgrade-browser-access-failure-with-dns-name-but-ip-works/17957 "2020-11-24T13:31:12Z")
**Posts on this page:** 6
**Page:** 1
### Author:  [@tmacgbay](https://community.graylog.org/u/tmacgbay)
#### Post date: [November 24, 2020, 1:31pm UTC](https://community.graylog.org/t/4-0-upgrade-browser-access-failure-with-dns-name-but-ip-works/17957/1 "2020-11-24T13:31:12Z")
Upgraded to 4.0 and now modern browsers fail (Chrome, Firefox, Edge) on hostname access but I am able to connect if I use the server IP. interestingly I can access the server from the most recent version of Internet Explorer with the hostname I was using before. no https… not using certificates (yet)
The Browser error message is:
```
Request has been terminated
Possible causes: the network is offline, Origin is not allowed by Access-Control-Allow-Origin, the page is being unloaded, etc.
```
and when I open the developer window (F12) I see the following error:
`Access to XMLHttpRequest at 'http://192.168.7.178:9000/api/' from origin 'http://glog:9000' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource.`
Has anyone seen anything like this? It feels like a “did you check this box here” solution but I haven’t found it after poking around for a while.
If it helps at all, I also see this in the Developer area:
```
GET http://192.168.2.218:9000/api/ net::ERR_FAILED client.js:837
m._end @ client.js:837
m.end @ client.js:711
(anonymous) @ index.js:80
I @ bluebird.js:1033
I._resolveFromExecutor @ bluebird.js:3337
I @ bluebird.js:2922
i.promise @ index.js:79
i.then @ index.js:121
ping @ ServerAvailabilityStore.js:41
setInterval (async)
(anonymous) @ AppFacade.jsx:40
cs @ vendor.594b2a39cb22b445205e.js:2
Oc @ vendor.594b2a39cb22b445205e.js:2
exports.unstable_runWithPriority @ vendor.594b2a39cb22b445205e.js:2
Ua @ vendor.594b2a39cb22b445205e.js:2
Ac @ vendor.594b2a39cb22b445205e.js:2
sc @ vendor.594b2a39cb22b445205e.js:2
(anonymous) @ vendor.594b2a39cb22b445205e.js:2
exports.unstable_runWithPriority @ vendor.594b2a39cb22b445205e.js:2
Ua @ vendor.594b2a39cb22b445205e.js:2
Za @ vendor.594b2a39cb22b445205e.js:2
Va @ vendor.594b2a39cb22b445205e.js:2
uc @ vendor.594b2a39cb22b445205e.js:2
Zc @ vendor.594b2a39cb22b445205e.js:2
exports.render @ vendor.594b2a39cb22b445205e.js:2
(anonymous) @ index.jsx:38
window.onload @ index.jsx:54
load (async)
95eaLShZ @ index.jsx:49
o @ bootstrap:63
(anonymous) @ bootstrap:198
(anonymous) @ app.333c3fdac03b8317da4b.js:2
```
---
### Author:  [@aaronsachs](https://community.graylog.org/u/aaronsachs)
#### Post date: [November 24, 2020, 5:26pm UTC](https://community.graylog.org/t/4-0-upgrade-browser-access-failure-with-dns-name-but-ip-works/17957/2 "2020-11-24T17:26:21Z")
Howdy–are you accessing the node through a reverse proxy at all?
---
### Author:  [@tmacgbay](https://community.graylog.org/u/tmacgbay)
#### Post date: [November 24, 2020, 5:50pm UTC](https://community.graylog.org/t/4-0-upgrade-browser-access-failure-with-dns-name-but-ip-works/17957/3 "2020-11-24T17:50:05Z")
No proxy. Possible that I am missing a new graylog setting…
---
### Author:  [@aaronsachs](https://community.graylog.org/u/aaronsachs)
#### Post date: [November 24, 2020, 6:06pm UTC](https://community.graylog.org/t/4-0-upgrade-browser-access-failure-with-dns-name-but-ip-works/17957/4 "2020-11-24T18:06:04Z")
Hmmm, the only thing that I’m seeing in my config is:
```auto
#### Enable CORS headers for HTTP interface
#
# This is necessary for JS-clients accessing the server directly.
# If these are disabled, modern browsers will not be able to retrieve resources from the server.
# This is enabled by default. Uncomment the next line to disable it.
http_enable_cors = true
```
Maybe try that if it’s not presently enabled?
---
### Author:  [@tmacgbay](https://community.graylog.org/u/tmacgbay)
#### Post date: [November 24, 2020, 7:35pm UTC](https://community.graylog.org/t/4-0-upgrade-browser-access-failure-with-dns-name-but-ip-works/17957/5 "2020-11-24T19:35:51Z")
That was the checkbox!! Thank you! Turns out that settings commented out in config files show up as dark blue… which is hard for old man eyes to read …
---
### Author:  [@system](https://community.graylog.org/u/system)
#### Post date: [December 8, 2020, 7:36pm UTC](https://community.graylog.org/t/4-0-upgrade-browser-access-failure-with-dns-name-but-ip-works/17957/6 "2020-12-08T19:36:00Z")
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