Step 1.
if you login to arcgis server manager too many time, server admin account could be locked.
you will see error when login server manager.
You can unlock by reset password.
first, go to arc server log directory,

Step 2.
use CMD to run change password command

Step 3.
reset password , use the old password , it will run forever, you don't have to wait.
you already can login

Step 4.
when install arcgis server, you were ask to create a windows local account.
How to find out what is this account name?
open service, find arcgis server serivce, in this case, "arcgis" is windows local account name

Step 5.
verify arcgis server windows local install account password by

Step 6.
verify arcgis server windows local install account password by
you can see account name is here
enter password,
if success, you will see next page,
if password is wrong, then you will see error

Step 7.
if you see this page, means your arcgis server windows local account password is correct.
otherwise, you will see error.
Stop here. done

Step 8.
before federate, you will use arcgis server server admin to login server manager and connect from ArcPro.
After federate, you no longer can use old server admin to connect in ArcPro,
instead you will use portaladmin to create connection

Step 9.
this is before federate or do not have federate portal, you will use siteadmin ( arcgis server server admin account) to create connection in ArcPro

Step 10.
every web adaptor installed, all list here

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