manuthu opened a new issue #5267:
URL: https://github.com/apache/cloudstack/issues/5267
##### ISSUE TYPE
<!-- Pick one below and delete the rest -->
* Bug Report
##### COMPONENT NAME
<!--
Categorize the issue, e.g. API, VR, VPN, UI, etc.
-->
~~~
UI, API
~~~
##### CLOUDSTACK VERSION
<!--
New line separated list of affected versions, commit ID for issues on main
branch.
-->
~~~
4.15.1.0
~~~
##### OS / ENVIRONMENT
<!--
Information about the environment if relevant, N/A otherwise
-->
```
[root@cloudstack ~]# cat /etc/centos-release
CentOS Linux release 7.4.1708 (Core)
```
##### SUMMARY
<!-- Explain the problem/feature briefly -->
We recently upgraded our cloudstack environment from v4.13.0.0 to v4.15.1.0.
The error we currently are experiencing is when login. An error is raised
`Exception caught while discovering features`
This prevents users from accessing the portal.
On inspecting the network, the `listApis` call made during the Login
discovery phase returns a `504 - Gateway timeout error. `
This is also reproducable while using cloudmonkey.
```
🐱 > set display text
🐱 > list apis
[debug] ExecLine line:list apis
[debug] ExecCmd args: list, apis
[debug] NewAPIRequest API request
URL:https://portal.nbo.angani.co/client/api?apiKey=xxxxxx&command=listApis&response=json&signature=xxxx
[debug] NewAPIRequest response status code:504
[debug] NewAPIRequest response body:<html>
<head><title>504 Gateway Time-out</title></head>
<body bgcolor="white">
<center><h1>504 Gateway Time-out</h1></center>
<hr><center>nginx/1.12.0</center>
</body>
</html>
🙈 Error: failed to decode response
```
##### STEPS TO REPRODUCE
<!--
For bugs, show exactly how to reproduce the problem, using a minimal
test-case. Use Screenshots if accurate.
For new features, show how the feature would be used.
-->
<!-- Paste example playbooks or commands between quotes below -->
~~~
🐱 > set display text
🐱 > list apis
~~~
<!-- You can also paste gist.github.com links for larger files -->
##### EXPECTED RESULTS
<!-- What did you expect to happen when running the steps above? -->
~~~
A `HTTP 200` from the server.
~~~
##### ACTUAL RESULTS
<!-- What actually happened? -->
<!-- Paste verbatim command output between quotes below -->
~~~
[debug] NewAPIRequest response body:<html>
<head><title>504 Gateway Time-out</title></head>
<body bgcolor="white">
<center><h1>504 Gateway Time-out</h1></center>
<hr><center>nginx/1.12.0</center>
</body>
</html>
~~~
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