The password supplied with the username Administrator was not correct ” Error while creating web application in SharePoint

Recently I encounter one error in SharePoint 2010,  I just change the password of admin user of  SharePoint 2010. After that when I open the Central administration it seems crash! because I didn’t change the password of each the Appool use by the admin group of share point  central administration. When I change it seems fine and working perfectly  but when I try to create a new web application on the farm it showed me erorr somethign like that.
Error :
The password supplied with the username .\Administrator was not correct. Verify that it was entered correctly and try again” Error while creating web application in SharePoint 2010.

but after lil search I found that to change the app pool password is not enough, we need to change it by power shall as well in share point server 2010

go to the power shall and enter the command with you credential.

stsadm -o updatefarmcredentials -userlogin <domain\username> –password<newpassword>.

When I run this command getting error : command line error, I am findinding solution.

Activate Solution is Disabled (greyed out).

Solutions

Following are the solutions that we can try one-by-one:

1. Restart Internet Explorer in Administrator Mode
2. Ensure SharePoint User Code Host is running in Windows Services
3. Ensure Microsoft SharePoint Foundation Sandboxed Code Service is started in Central Administration > Manage Services

Once applying the solution(s) the Activate button turned to be Enabled now. 

Error while creating web application in SharePoint 2013 : The password supplied with the username domainname\username was not correct.

Problem :

“The password supplied with the username .\Administrator was not correct. Verify that it was entered correctly and try again” Error while creating web application in SharePoint 2013

Solution:

I got that error while creating a new web application in SharePoint 2013. Actually recently we had changed the password of the administrator account. However we had to follow this extra step to get the things working properly.

Run the sharepoint powershell console as Administrator and run this command.

stsadm -o updatefarmcredentials -userlogin <domain\username> –password <newpassword>

SharePoint 2013 Central Administration Ribbons Grayed Out

Problem:

On SharePoint 2013 some ribbons from the Central Administration Area are grayed out. The user is a farm admin.
For example: New Web Application, New Service Application.

Solution:

Start SharePoint 2013 Central Administration from the Start Menu icon
- or -
run Internet Explorer as Administrator.