I wrote:

I'm sure it's the server. Did you even look into it? It works on non SSL. I've used this script many times off SSL. It has nothing to do with SSL. It's the server set up. Even when I do disable SSL It still forces to a SSL URL. Please look into it.

You can tell them that the server interprets slashes "/" as mnemonic"%252F" they need to fix this. 

This is what they wrote.. what does this mean:

Hello,

The index.php file in folder ow_updates contain the following lines :
###
$currentParams = array_merge($currentParams, $paramsToUpdate);

return $requestUrlArray['scheme'] . '://' . $requestUrlArray['host'] . $requestUrlArray['path'] . '?' . http_build_query($currentParams) . ( $anchor === null ? '' : '#' . trim($anchor) );
}

function printVar( $var )
###
$currentParams = array_merge($currentParams, $paramsToUpdate);

return $requestUrlArray['scheme'] . '://' . $requestUrlArray['host'] . $requestUrlArray['path'] . '?' . http_build_query($currentParams) . ( $anchor === null ? '' : '#' . trim($anchor) );
}

function printVar( $var )
###

###

###
The http-equiv attribute provides an HTTP header for the information/value of the content attribute.
The http-equiv attribute can be used to simulate an HTTP response header.

Matthew, please look here: https://www.google.ru/?gws_rd=ssl#newwindow=1&q=index.php+port+443+

I think the problem after all with your SSL certificate

the problem is that when I click update for some reason server redirects me to the index page and via 443, however it should go to update folder of the plugin to update the plugin. 

My host said this:

Hi,

It seems your file contains some invisible code, in order to fix this issue I advise you the following:
1. Download the file on your local computer
2. Open it in some simple text editor like notepad
3. Add the code and save the file (or just save the file)
4. Upload it into your account over the outdated file


Please get back to us if you need any further assistance and let us know how else we can help.

Host said:

Hi Matthew,

Since nothing is being recorded in the apache error log while reproducing the issue this appears to be an internal issue with your software rather then a serverside problem. I'm afraid this is not something we can fix for you, please consider hiring a third-party developer. The only thing we can advise is checking your software is it's not requiring SSL v3 support - it has been disabled not long ago due to vulnerability.

Matthew what file are they referring to?

As I said Mathew, for some reason the update is redirected to index.php via 443, however it should not, and it has something to do with 443 port which is probably closed and SSL certificate. 

host 443 is open. I'm getting no results. Guess I'll ask SSL about certificate... file in ow_updates/index.php

Alright, Keep us updated.