Horde webmail : Content Encoding Error (content_encoding_error)

This happened in a windows server and error don’t occur for everyone, only for those from Middle East. IIS has inbuilt http compression. Error was as below,

Content Encoding Error (content_encoding_error)

Server response could not be decoded using encoding type returned by server.
This is typically caused by a Web Site presenting a content encoding header of one type, and then encoding the data differently.

For assistance, contact your network support team.

You can fix this by

Editing the Horde config file ‘conf.php’ on the server located at DriveLetter:\Inetpub\vhosts\webmail\horde\config\conf. php (Driveletter can be C or D. If D, its  a good web host with good planning )

Search for the following in that config file:
$conf['compress_pages'] = true;

Change it into:
$conf['compress_pages'] = false;

Save the horde config file & restart the webmail client (I mean IIS here) and reply back

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