Logon screen is not available to the Chrome browser if i am using the following url http://<host>:<port>/irj/portal,
but i can able to login using the url http://<host>:<port>/nwa.
later i change the url to /irj/portal instead of /nwa then i noticed that masthead is able to appear.
i don't know why only the error is showing for the logon page before login into portal.
Could not open iView. The iView is not compatible with your browser, operating system, or device. Contact your system administrator for more information.
As per the PAM my portal version is suitable for Chrome.
my portal version is 7.31 sp8