I’m working on a server that is using, in production what is admittedly a very 
old version of horde imp. Still, the server has been there unchanged for a few 
years. A strange problem has developed in one aspect of horde imp in the last 
couple of months, though.

Everything about the server is fine, except that some users (not all) are 
having a problem when it comes to clicking on a message in the inbox and 
opening it. Opening the message takes almost exactly (I have timed it with a 
stopwatch many times) 77 seconds to open. Every other aspect of the horde 
server works fine and responds immediately.

I have tried calling the horde imp webmail interface through both ssl and non 
ssl versions. Both have the same problem. We have a squirrelmail webmail 
interface that works with the same imap server. It does not have this problem. 
We have other imap interfaces that work fine. The problem is just some users of 
the horde imp software, and specifically only with calling message.php through 
horde.

I have put wireshark on the browser system and watched the communication. The 
get request for message.php is sent immediately by the server when the link is 
clicked in the inbox. The server acks the response, but the get request does 
not show up in the webserver logs. Then, for 77 seconds, nothing apparently 
happens on either the client or server side (except for the sidebar.php 
refreshes, which work fine through this whole process). Then, 77 seconds later, 
the get request appears in the webserver log, is responded to immediately, and 
the message appears in the browser interface.

I have been going through every timeout I can find, php.ini, ssl, the horde imp 
configuaration, nothing makes any difference. The webserver seems to be 
processing *something* in message.php, timing out, and then going ahead and 
sending the message.

At this point I would be happy to hear any ideas someone might have.

I’ve set php to E_ALL for logging, nothing appears in the webserver access or 
error logs beyond the http exchange.
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