SETUP:
1. Server 2003 for SBS.
2. ISA as proxy and firewall setup.
3. Exchange server for email.
4. 2x Network cards, one for LAN, other connects straight to ADSL modem (1.5Mbit).
5. Connects to the net via ISA and shares the net via proxy to all users.
6. Email resides on external mail server until retrieved by Exchange Server.
7. Mailboxes are setup in POP3 connector all settings are correct.
This SETUP has been in place with no faults for over 2yrs.
ISSUES:
1. Troubles Retrieving/Sending emails.
2. Firewall issues with some applications and websites.
3. On server hard restart Internet Connection deletes its self, we then have to run the Connections wizard and re-enable our packet filters.
SENDING EMAILS:
1. Outgoing email issues were fixed initially by changing SMTP server to alternate and disabling ETRN.
2. Email queues were back to normal and there has been no queue issue since.
3. Randomly Users have sent emails to find they haven't been received by the receipient.
RECEIVING EMAILS:
1. POP3 Connector was thought to be the issue with receiving emails because of all the errors it lists in the Event Logs.
2. Event IDs 1019, 1023 & 1036 were checked on
www.eventid.net - it was something causing POP3 Connector to act inproperly.
3. All Exchance related services were then restarted with no success, email still remained on external mail server.
4. It was a Firewall issue, I restarted ISA Server Control services and all emails came flooding, all firewall issues were fixed.
So naturally i thought i'd fixed the issue, however the POP3 Connector errors keep coming up and the entire issue repeats its self every morning.
Every Single Morning i have to restart all the ISA and Exchange related services to fix the email and firewall issues, so its like it works for several hours and then it mucks up again.
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