M4IS:13 Forbidden Error
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I have a rather difficult issue that I have no idea how to figure out. We’ve been undergoing a lot of maintenance with our site over the last few months, and it seems just about everything looks and runs great, but we’ve been having this really strange, super specific issue. I do not know if this is the right source, but figure it could be a place to start.
Our site is a membership/learning site, and 99% of the time, our members are able to login with no issue. Every once in a while, however, we will get a message from a member that when they try to log in, they get directed to a white page that says only “M4IS:13 Forbidden.” I have searched everywhere, and can find no documentation on this error anywhere on the internet.
Another strange thing is, it seems very targeted as to whom it affects. If a member messages us with this issue, it does not work for them if they clear cache, try a different browser, or even another device. But, if I or one of our support members tries to log in using the member’s credentials, even on a fresh cache, everything works fine. I have tried my computer, three different browsers, and my mobile phone and can’t replicate the issue, but we have had a number of members message us the same thing (luckily not enough to kill our business, but obviously we want all of our members to be happy). Any help would be appreciated if anyone knows what this is and how to fix it. Thanks!
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So, the URL of the site is https://eshopmarketer.com, but it does not happen to everyone, and when it does happen, it only happens when they login.
I did not have WordPress logging enabled, so I just did that, but my cPanel Apache logging just has a bunch of stuff like this:
[Fri Dec 25 07:23:37.503339 2020] [autoindex:error] [pid 1146720:tid 47360807929600] [client {ip_address}] AH01276: Cannot serve directory /home/{cpanel_username}/public_html/wp-content/uploads/: No matching DirectoryIndex (index.html.var,index.htm,index.html,index.xhtml,index.wml,index.perl,index.pl,index.plx,index.ppl,index.cgi,index.jsp,index.js,index.jp,index.php4,index.php3,index.php,index.phtml,index.shtml,default.htm,default.html,home.htm,index.php5,Default.html,Default.htm,home.html,welcome.html) found, and server-generated directory index forbidden by Options directive
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