You must log in with your @satri.org Google account to view the SATRI Internal site. Note that if you login with a Google account other than your @satri.org account, you will likely see a 404 message rather than a "permission denied" message.
If you do not know your SATRI Google account or are having trouble logging in, you can try using the "Forgot password?" link to get a text or emailed verification code. If that doesn't work, please reach out to the secretary or webmaster for a password reset.
When resetting your password, if you see a message like "admin.google.com is used for G Suite accounts only. Regular Gmail accounts cannot be used to sign in to admin.google.com", this means your login likely succeeded but Google is trying to redirect you incorrectly. Instead, try navigating to another site, such as Mail or Calendar.