Unable to Log In, Cookies Are Blocked Due To Unexpected Output

Best place to start, in my opinion, is by changing your wp-config.php file and change the value of WP_DEBUG to TRUE. No guarantees, but I strongly suspect that that will give you a meaningful error message on the wp-login.php page. If not, also try https://www.sgsss.org/wp-admin/ as it currently showing just a white page (WSOD). One of the two pages will likely have an error message with WP_DEBUG turned on.

More details here: https://codex.www.ads-software.com/Editing_wp-config.php

Try disabling your plugins and themes via your FTP client.

Cannot modify header information – headers already sent by (output started at /home/sgsss/public_html/wp-content/themes/response/core/actions/footer-actions.php:1) in /home/sgsss/public_html/wp-includes/class-IXR.php on line 508

thats the error that comes up

i dont know what that means?

Have you recently updated WordPress?

Based on that message, there may be issues with your Theme. If you rename the folder /home/sgsss/public_html/wp-content/themes/response to …/response-test you should be able to login though it will default to the current default theme.

thank you it now has got rid of the message but is not allowing me to log in as it says invaild password?!!!

thank you very much i have now logged in

my website is now blank ?????

white page?

I would start by going to Appearance-Themes in the Admin panels to see what your Active Theme is, if any. Obviously, you need an Active theme to be able to view your site.

Of course, you can’t select your old theme as it has got problems.

You really have to decide whether to find a new theme or try and get the old one fixed.

the problem has come back?!!

PHP Warning: Cannot modify header information – headers already sent by (output started at /home/sgsss/public_html/wp-content/themes/response-test/core/actions/footer-actions.php:1) in /home/sgsss/public_html/wp-includes/class-IXR.php on line 405, referer: https://www.sgsss.org/
PHP Notice: Trying to get property of non-object in /home/sgsss/public_html/wp-content/themes/response-test/core/core-functions.php on line 302, referer: https://www.sgsss.org/

that is what displays

Of course, you can’t select your old theme as it has got problems.

THank you

For fix this issue check your log file(debug.log)

When checking your error log file, check the error logs for the date, you started to get the error. In error messages check if it says anything like: “Cannot modify header information – headers already sent by (output started at”) and then go to file path (file path :in debug log file) check where is the issue. some time due to white space end of the file or closing php (?>) tag causes this issue. remove the white space end of the file and check.

More Detail Here: https://www.wpseeds.com/blog/error-cookies-are-blocked-due-to-unexpected-output/