401 Error When Logging In

Hi VenkateshS329,

Are you using environment in http or https?

If you are using environment on http, You need to follow the process given in post installations steps below.

SCHEME

By default your site will use HTTPS for the SCHEME. HTTPS is required for production systems. If you wish to run a non-production site over HTTP instead of HTTPS, set the following property in custom.properties.

conf.suite.SCHEME=http
By default, session cookies are marked as "secure" and "httpOnly" for JBoss. If you change your url scheme to HTTP you will also need to adjust these defaults by removing the following lines from the session-config element in <APPIAN_HOME>\ear\suite.ear\web.war\WEB-INF\web.xml.

<cookie-config>
<http-only>true</http-only>
<secure>true</secure>
</cookie-config>
<tracking-mode>COOKIE</tracking-mode>
If you are running an application server other than JBoss, you must consult the documentation provided by the application server vendor for how to configure a web application to use secure, HTTP-only, cookies and adjust web.xml accordingly.

For your referance.
docs.appian.com/.../Post-Install_Configurations.html

Thanks for the response @manishs419 ,
We are using https and We have removed above tags from the web.xml file.

Thanks for the response @manishs419 ,
We are using https and We have removed above tags from the web.xml file.