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Article ID: 1435, created on Oct 6, 2008, last review on May 10, 2014

  • Applies to:
  • Operations Automation


Trying to login to Horde Webmail from customer's CP you can receive the following errors:
Proxy ErrorThe proxy server received an invalid response from an upstream server.
The proxy server could not handle the request GET /horde/login.php.
Reason: Error reading from remote server
Apache/2.0.52 (Red Hat) FrontPage/ mod_ssl/2.0.52 OpenSSL/0.9.7aServer at Port 443

This error could appear only in the case when Branded Access Point is configured for webmail.


Reconfigure branding config to redirect requests to http instead of https.

Open the file /usr/local/pem/vhosts/<access_point_hd_id>/webspace/httpsdocs/[cp/].branding_htaccess for editing and replace https with http in strings related to Horde webmail:

RewriteRule ^horde/(.*)$$1 [P,L]
RewriteRule ^webmail/<id>/(.*)$ [P,L]

Additional changes are required for IMP 4.1.x:
Open the file /usr/local/pem/vhosts/webmail/horde/lib/Horde.php for editing and add the following strings to sources:
--- Horde.php 2006-10-19 00:01:38.000000000 -0700
+++ Horde.php.orig 2006-10-19 03:49:17.000000000 -0700
@@ -545,7 +545,6 @@
if ($force_ssl) {
$full = true;
- $full = false;
if ($full) {
global $conf, $registry, $browser;

@@ -624,7 +623,6 @@
function applicationUrl($uri, $full = false, $append_session = 0)
- $full = false;
if ($full) {
return Horde::url($uri, $full, $append_session);

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