[imp] IMAP dropping connection to IMP

[mojospam at thegeekclub.net]

I have three different versions of horde installed (stable, alpha, and RC1) and
all exhibit the same problem.  When viewing any email that has an attachment
over a few KB the webmail hangs for a long time then finally loads the page but
the attachment usually lists as being 0 bytes. If it is a picture, it is not
displayed and any attempt to view it hangs for a very long time and then
displays an error message (depending on which version of Horde).  From looking
at logs and sniffing on the loopback interface it would appear that Horde
requests the data and then never gets it. test.php checks out fine except for a
lack of mcal support.

This is not a new install either.  It was working once upon a time. Something
went wrong somewhere and i have been completely unable to trace this back to
whatever change must have triggered it. All processes are on the same machine
(imap, smtp, http, mysql, etc.) Btw, retrieving messages and attachments
through an IMAP client (I use Mozilla Thunderbird), works fine.

Server info:
RHEL3 (taroon 3)
MySQL3
Apache2/PHP 4.3.9 (w/ mcrypt, php-imap, php-mysql, PEAR, and mbstring)
Courier IMAP 3.08

Pear info:
# pear list
Installed packages:
===================
Package          Version State
Archive_Tar      1.2     stable
Auth_SASL        1.0.1   stable
Cache            1.5.4   stable
Console_Getopt   1.2     stable
DB               1.6.8   stable
Date             1.4.3   stable
File             1.0.3   stable
HTTP             1.3.3   stable
HTTP_Request     1.2.3   stable
Log              1.8.6   stable
Mail             1.1.4   stable
Mail_Mime        1.2.1   stable
Mail_Queue       1.1.3   stable
Net_DNS          1.00b2  beta
Net_IMAP         1.0.3   stable
Net_NNTP         0.11.3  beta
Net_POP3         1.3.3   stable
Net_SMTP         1.2.6   stable
Net_Socket       1.0.4   stable
Net_URL          1.0.14  stable
PEAR             1.3.3.1 stable
Services_Weather 1.3.1   stable
XML_Parser       1.2.1   stable
XML_RPC          1.1.0   stable


Could this be a problem with the cache?  perhaps Horde is unable to write cache
data to /tmp for some reason?   It writes the log ok but i never see any cache
files from horde there... anyone have any ideas?