This is definitely mod_security related. Looks like the Jelsoft server admins went power crazy with rules, making it impossible to make relevant posts.

Thank you for your response.
I can not update the add-on thread.

Um, please read above.

Jelsoft doesnt exist either, we run on IBs network and servers, the issue has been passed to them.

They still exist, in name only, for older vBulletin versions.
IB don't seem to have done anything much imo. I still get more and more 404's

I doubt you are getting any 404's. Bad request is status 400.

What IB are doing about it is beyond my immediate knowledge, we have informed them of the issue.

Would appreciate a rough idea , when the info is available of : What was done to fix the issue.

Just in case we ever have that problem. Only time I have had this kind of issue was with suhosin, but they returned 500 errors.

http://en.wikipedia.org/wiki/400_Bad...x_Client_Error

In Chrome, I just get:
"This Website is not available" which signifies to me as being a 404 (the moreinfo part says "Connection Reset")

this platform is no longer usable for me.
my two add-on threads are no longer editable:

vbsoccer (vb3) https://vborg.vbsupport.ru/showthread.php?t=237934
vbsoccer (vb4) https://vborg.vbsupport.ru/showthread.php?t=238043

"Bad Request"

browser: safari, OS: Mac OSX

We are pushing for a fast solution to these issues, but we can not do much more. We will need to wait until the technicians find the cause.

The problem exists for 8 days and nothing happened. my users can not wait any longer.
I use temporary "google code".