privatePage snippet redirect

Do you have &redirectToPrior=`1` in the Login snippet tag?

That does make sense.

Everything below assumes that you are using &redirectToPrior=`1`.

In the snippet, are you using sendRedirect() or sendForward()? If it's sendForward(), try sendRedirect().

If it's sendRedirect, you might try some of the possible second arguments to see if they make a difference: https://docs.modx.com/revolution/2.x/developing-in-modx/other-development-resources/class-reference/modx/modx.sendredirect

The form would be:

$modx->sendRedirect($url, array('REDIRECT_HEADER');

If none of that works, you could try getting the URL of the current page and setting the $_SERVER variables. I'm not sure it would work:

That would look like this (above the redirect):

$docId = $modx->resource->get('id');
$currentUrl = $modx->makeUrl($docId, "", "", "full");

$_SERVER['REQUEST_URI'] = $currentUrl;
$_SERVER['HTTP_REFERER'] = $currentUrl;

I meant the PrivatePage snippet. Oddly, I don't actually have a copy of it, so I can't check, but it must redirect the user to the Login page and I don't know how else that could happen.

<?php
/* PrivatePage snippet */
/* Redirect anyone who is not logged in */
 
$key = $modx->context->get('key');
if (! $modx->user->hasSessionContext($key)) {
   $modx->sendUnauthorizedPage();
}
return '';

Try this:

<!--?php
/* PrivatePage snippet */
/* Redirect anyone who is not logged in */
  
$key = $modx--->context->get('key');
if (! $modx->user->hasSessionContext($key)) {
    $loginId = '12'; /* change this to the ID of your Login page !!! */
    $loginUrl = $modx->makeUrl($loginId, "", "", "full");
    $modx->sendRedirect($loginUrl);
}
return '';

Be sure to clear the cache before testing.

If it doesn't work, try adding this just above the sendRedirect() line:

$docId = $modx->resource->get('id');
$currentUrl = $modx->makeUrl($docId, "", "", "full");
 
$_SERVER['REQUEST_URI'] = $currentUrl;
$_SERVER['HTTP_REFERER'] = $currentUrl;

[[!Login?
&loginTpl=`lgnLoginTpl`
&logoutTpl=`lgnLogoutTpl`
&errTpl=`lgnErrTpl`
&logoutResourceId=`111`
&redirectToPrior=`1`
]]

&loginResourceId=`3`