Wordpress - Why I get 411 Length required error? - wordpress

since some days ago I got an error if I try to update menues and some pages.
I get a white Page with 411 requiered length error.
Never had this before.
Wordpress 5.8 and before.
Any idea?
Thanks.

Check if you gave BitDefender activated. It seems to have received some kind of an update that blocks some requests. I had this issue with my website too, also with several others and disabling Protection Shield solved the issue.

Yes, Bitdefender is the problem. But I tried other AV programs to compare, including Windows Defender and Avast, and the problem does not exist with them. This seems to be a BD-specific issue, which I hope someone will fix. I like Bitdefender (Free), but this is really a nuisance. It's also theoretically dangerous to suspend malware protection.

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Waiting for meetlookup.com

When my site's WordPress admin dashboard is loading, I get a suspicious message on the bottom-left of the page, saying Waiting for meetlookup.com....
The message should be Waiting for <my_domain>.<my_tld>...
I think my site has been hacked by some malicious plugin or theme, but I don't know how to address the problem.
in my experience, that's caused by browser extension, you can try with disable your extension and try reload.
I don't have an answer or certain solution, but I was experiencing the same behavior on one of my desktops. Linux Mint 20.1 Ulyssa using Chrome Version 91.0.4472.77
I ran a security check of my extensions with nothing coming back as suspect. I disabled one (Getcolor) and cannot replicate the "waiting for meetlookup.com" after that. Interestingly that particular extension that I just installed to use once last week appears to no longer be listed in the Chrome web store.
It is spyware. After uninstalling all extensions are gone. I recommend changing your passwords as they were exposed :(

Get detailed report Why website is detected as phishing attempt

One of the apps that I'm working on recently received phishing detection by BitDefender service. I wonder, what may the cause such a scenario?
It uses up to date version of the WordPress.
Here is the report:
https://www.virustotal.com/#/url/7399557ed6efe17e14c6248740d1a17094ec87b63646123b56a148a9ae1e353c/detection
I've already written to BitDefender for an extra explanation but didn't receive any info yet.
This site tells me that from their perspective something is not OK:
https://zulu.zscaler.com/submission/e9aa7749-b684-467a-be17-fe874eaf6514
Could that be the 302 redirect from non-secure to secure version of the website that causes the issue? Should I switch to 301 instead?
Thanks in advance for any clue.
I've already resolved the issue. In fact, someone reported us (probably competitor) and the default strategy in such case is to mark page us phishing. For de-listing, I've contacted BitDefender directly and they did manual check and delisting after 3-4 days.
Thanks, everyone for your effort!

Why would an Apache Server timeout on first httpd request?

I have an odd issue with my Apache Server. Almost every single time the server gets a timeout on the httpd first request, and then I hit reload and the page loads right up. What could possibly cause this?
I looked into the server errors, there is nothing except that wdaemon is not running. I looked into top and everything looks fine. I checked on GTmetrix and it also gets timeout on first request! And when GTmetrix returns the stats nothing looks out of the ordinary.
The httpd requests a WordPress project, using a 3rd party plugin (P3 Plugin Profiler) I analyze the active plugin response and it also looks fine, average.
I appreciate any help!
Well, well, well... StackOverflow has some powerfull magic! Everytime I take the time to ask question, I seem to figure out the answer right after it. Feel free to delete this question, if any moderator feels like so.
Anyway, the problem indeed was internal, not server related. After analyzing with more caution I noticed a plugin was taking too long to load so I disabled it and it made all the difference. Funny thing about it, it is the only plugin I actually had to pay for.
Anyway, thanks SO!
Could be all sorts of things. WordPress can be a nightmare for performance - usually as a result of too many, badly written plugins. But the first place to check is your PHP opcode cache how you interest the data depends on which opcode cache you are using - APC is a very different beast from then zend cache. You didn't say which applies here, but even describing just one goes way beyond what's practical here. If you have any plugins, you should have listed them in your question. Try disabling them all and see if the problem persists. Then start adding them back one at a time till the problem recurs.
If you think you have sufficient understanding of the profiler to make a diagnosis why did you tell us about it? If your not an expert in profiling WordPress why didn't you include the output of the profiler in your question?

occasional client error fullcalendar.js

I am trying to help sort a friend's issue with their fullcalendar.js implementation.
The problem thus far is the events not loading consistently. Before uploading it to the Godaddy domain it worked every time but is spotty at best now. I looked at the Google developers tools and the credentials are all squared but saw that there is a client error happening however, I'm not sure where to look to fix an occasional problem? I am led to believe it is some sort of server issue but don't know where to start looking.
I don't have any rep so no pics, here is a link to the dashboard.
https://www.dropbox.com/s/x1xfuyonavxz3vi/Screen%20Shot%202015-01-07%20at%2010.42.53%20PM.png?dl=0
Any help would be amazing, thanks!
Edit:
I contacted Godaddy to no avail, they said it was Google's issue and I should contact them.. which isn't possible without paying for it.. Also, I found a work around: if I refresh the page navigate away and return it loads correctly.. any ideas on how to code it so if it fails to load I can get the same process?
Hopefully this will help someone else, but...
I fixed my problem by changing the hierarchy of my files. I moved the calendar to the public html folder instead of the nested html folder. It seems as if the Jquery request to Google was getting interrupted or bogged down somehow, but, thus far I'm digging the 100% success rate. If anyone cares to weigh-in further, I'm happy to hear other suggestions.

Slow page load after Wordpress 4.0.1 update

All my WP sites ran perfectly fast until they got automatically updated to 4.0.1, now they each take approximately 3 minutes to load any page, even in admin. I am using different hostings on those pages, so it's not server related.
http://i.stack.imgur.com/xCDF2.png
Do you please have any ideas what might be causing the problem or what should I try to do? I tried rolling back to 4.0 but the slowness stays. I'm getting desperate.
I was facing the same problem, i guess you are using the same template on your all sites. I recommend to change your theme to Twenty Fourteen.
In my case I narrowed the issue down to the options table of the WordPress database. I'm not entirely sure which rogue option caused the issue after updating to 4.0.1 but something was choking it up pretty badly as every page request was taking 2-3min to load both on front and backend.
I've replaced the options table with a fresh one and the problem was gone. The issue was resolved easily in my case as the website was fairly simple, however, if yours has numerous option values then your only hope it so dissect the table to find what could be choking it.

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