Enable standard Wordpress Debug to a LOG and update here with the findings.

@mistral An other suggestion to minimize your problem. Not sure if it will help you or not, just an idea (i also have implemented for other purposes a...

Well, ask them, tell them what kind of sites you have in means of size and traffic.    

Ok, Cpanel is a Control Panel for all your domains, emails, dns, backups, php tuning. As for hosting in US, i can only highly recommend the one i use...

@gav are you located in Europe or US ? How do you manage your sites ? How many sites are those ? I ask for CPanel because if you do have that, it ...

Then if you have Cpanel, it is SO EASY. A full PLAN Backup, download it locally and send it to your new hosting provider with Cpanel or manually trans...

Do you have a CPANEL ?

Well it is simpler and better to catch those BEFORE they register/enter. And not after. In a busy forum, it is impossible to check all profiles etc et...

Checking your site IP, doesn't look nice. This IP is shared of cource and nothing wrong with YOUR site, still not good. I will not post here what co...

If you have Cpanel, moving is easy. But i know what you mean. It is probably their warning you get, still they know from where it comes.

What kind of hosting plan is that ? Shared ? Where ? And please do not use the Post title as post body, i mean you wrote a huge title.

Google " The requested URL was rejected. If you think this is an error, please contact the webmaster. Your support ID is: " and try each suggestion. ...

Also have you tried with one browser or a few ? Could be a local (your pc) issue ? Some addon on the browser ?

Check this topic and then run your URL check at: And let us know ....