After Login with User Name and PSW 404 error

Using WP 3.0.1

Would help to see the website. And you did not say if the site is visible.
Try disabling plugins. (Rename current /plugins directory and create a new plugins directory)
Try the default theme. (Rename the current Theme directory)
Check wp-config.php
Check DB for proper URL.

Yes the site works fine. https://www.rebaxter.net

I need to figure out a way to troubleshoot this. The site has been up and working for sometime. This problem just appeared out of nowhere. I have not added any new plugins.

Help in troubleshooting where the problem might lie would be VERY much appreciated.

Did you follow the steps I already gave to you?

This is a business web site, to disable all the plugins will stop the site from working. I have re-loaded the wp-config.php from a backup.
I do not understand your DB URL comment.

I need to figure this out with minimal disruption instead of taking the site down.

Are there any troubleshooting techniques to try to determine what could have caused this change?
Thanks a million !

Dan

One other observation. I have to delete the cookies from the browser to get the user id password screen. Once I do that the normal logon screen appears and I can enter user name and password then i get the 404 error. If I just enter https://www.rebaxter.net/wp-admin I get the 404 error without it even asking for name and password. I supposed this could be because it is saving both user name and password…

This is a business web site, to disable all the plugins will stop the site from working.

You only have to do it temporarily. It’s part of basic troubleshooting. You’d be surprised at how much trouble a bad plugin can cause. Just manually reset your plugins. If that resolves the issue, reactivate each one individually until you find the cause.

I do not understand your DB URL comment.

You’ll have to access your WordPress database via phpMyAdmin (most hosting providers offer this in their control panel) and make sure that the siteurl and home values are set to https://www.rebaxter.net

Are there any troubleshooting techniques to try to determine what could have caused this change?

webjunk has suggested some great basic troubleshooting techniques. Start with those.

Help in troubleshooting where the problem might lie would be VERY much appreciated.

Well, why don’t we take it logically.

A) using any redirect plugins?

B) made any recent changes to permalinks or .htaccess (no matter how insignificant you might think they could be) or SEO plugins or settings?

C) maybe taking a look at the actual url mentioned in the error message when it 404’s will tell us what file can’t be found, and lead to the next clue.

After taking a look around the site and reading this page – and mind you this is pure 100% guesswork on my part – you could try disabling the fluency-admin plugin using an ftp client, clear your browser cache and then go back and see if the symptom changes with the WordPress login page in place. Pure guesswork mind you.

I do not understand your DB URL comment.

You’ll have to access your WordPress database via phpMyAdmin (most hosting providers offer this in their control panel) and make sure that the siteurl and home values are set to https://www.rebaxter.net
THIS IS DONE NO PROBLEM FOUND

After taking a look around the site and reading this page – and mind you this is pure 100% guesswork on my part – you could try disabling the fluency-admin plugin using an ftp client, clear your browser cache and then go back and see if the symptom changes with the WordPress login page in place. Pure guesswork mind you.

Thanks, for the tip, but no luck. Fluency was deleted from plugin directory

Ok I renamed the plugin directory, created a new one temporarily, tried to login again, and same result. I have renamed the plug in directory back.

What next ?

NEXT:
Try the default theme. (Rename the current Theme directory)
Check wp-config.php

You only have to try it for a minute.

After that look at .htaccess

So how about sharing with us the url that’s in the error message that comes up when it 404’s?

The normal redirect after login should probably land on /wp-admin/index.php – which in turn will load several other files which you can find listed inside of /wp-admin/index.php file. If one of those files is damaged, missing, altered, etc… for some reason, it could be an issue.

If neither of those produce any useful results, try downloading WordPress again and delete then replace your copies of everything except the wp-config.php file and the /wp-content/ directory with fresh copies from the download.

This is definitely going to take longer than a minute, but it’s necessary to rule-out file corruption.