Hi @atul-kumar.jha
Is this the first time you are logging into the Integration Server after installation? Or were you able to login before with an Administrator account and it stopped recently? If latter, most likely the Administrator account password is changed.
Anyways, you can try resetting the Administrator password. Please try the following.
Shut down IS, change the following values for Administrator in users.cnf, then start IS
<value name="pass" id="4"/>
<value name="passHash" id="5">manage</value>
The password will auto-hash
#Integration-Server-and-ESB#webMethods