smtp error sending test message

[pconrad]

I am unable to send test message via SMTP from my Cacti installation.
This is the message that I receive:

Unable to connect to SMTP Host '10.10.4.123': (13) Permission denied

What needs to be set up in order for Cacti to communicate via SMTP?

I am running

Cacti Version - 0.8.7a
Plugin Architecture - 1.4
Poller Type - CMD.php
Server Info - Linux 2.6.23.1-42.fc8
Web Server - Apache/2.2.6 (Fedora)
PHP - 5.2.4
PHP Extensions - libxml, xml, wddx, tokenizer, sysvshm, sysvsem, sysvmsg, session, pcre, SimpleXML, sockets, SPL, shmop, standard, Reflection, pspell, posix, iconv, hash, gmp, gettext, ftp, filter, exif, date, curl, ctype, calendar, bz2, zlib, openssl, apache2handler, dbase, gd, json, ldap, mysql, mysqli, PDO, pdo_mysql, pdo_sqlite, snmp, zip
MySQL - 5.0.45
RRDTool - 1.2.99907080300
SNMP - 5.4.1
Plugins

• Create Aggregate Graphs (aggregate - v0.64)
  PHP Network Weathermap (weathermap - v0.941)
  Global Plugin Settings (settings - v0.3)
  Thresholds (thold - v0.3.9)
  Syslog Monitoring (syslog - v0.5.2)
  Host Info (hostinfo - v0.2)
  Network Tools (tools - v0.2)
  Network Discovery (discovery - v0.8.3)

[mcutting]

Check that your SMTP server allows relay requests from your Cacti box IP Address.

It's also possible that you may need SMTP Auth (unless it's Exchange). If it is Exchange, and you have added the Cacti IP into to allow relay list, ensure that you stop and restart the SMTP Virtual Server for the changes to take effect.

[pconrad]

Threshold messages are working properly. It's just the test messages that are not working.

[mcutting]

THOLD uses the same SETTINGS plugin as the test email message. My guess if that this isn't SMTP related at all, but a security or permissions issue.

[pconrad]

That's what I thought, but I cannot find any information on this error message:

(13) Permission denied

What file permissions should I check?