Unknown error (-9808)

I get the same error I ran my diagnostics and it was:
Microsoft Windows XP Home Edition Service Pack 2 (Build 2600)
Hewlett-Packard HP Pavilion dv1000 (ET732UA#ABA)
iTunes 7.5.0.20
CD Driver 2.0.6.1
CD Driver DLL 2.0.6.2

Current user is an administrator.
The current local date and time is 2007-11-18 19:43:50.

Video Display Information:

Mobile Intel(R) 945GM Express Chipset Family
Mobile Intel(R) 945GM Express Chipset Family

** Network Connectivity Tests **

Network Adapter Information

Adapter Name: {A08FAD83-378E-4425-8E86-587A00C24B80}
Description: Intel(R) PRO/Wireless 3945ABG Network Connection - Packet Scheduler Miniport
IP Address: 192.168.0.100
Subnet Mask: 255.255.255.0
Default Gateway: 192.168.0.1
DHCP Enabled: Yes
DHCP Server: 192.168.0.1
Lease Obtained: Sun Nov 18 19:37:48 2007

Lease Expires: Sun Nov 25 19:37:48 2007

DNS Servers: 192.168.0.1
192.168.0.1

Adapter Name: {1B868B59-BF83-470B-BC1B-FD30C77CBA25}
Description: Intel(R) PRO/100 VE Network Connection - Packet Scheduler Miniport
IP Address: 0.0.0.0
Subnet Mask: 0.0.0.0
Default Gateway:
DHCP Enabled: Yes
DHCP Server: 192.168.0.1
Lease Obtained: Sun Aug 27 14:18:33 2006

Lease Expires: Sun Sep 03 14:18:33 2006

DNS Servers:

Active Connection: LAN Connection
Connected: Yes
Online: Yes
Using Modem: No
Using LAN: Yes
Using Proxy: No
SSL 3.0 Support: Enabled
TLS 1.0 Support: Enabled

Firewall Information

Windows Firewall is on.
iTunes is enabled in Windows Firewall.

Connection attempt to Apple web site was successful.
Connection attempt to iTunes Store was successful.
Secure connection attempt to iTunes Store was unsuccessful.
An unknown error occurred (-9808).
Secure connection attempt to iPhone activation server unsuccessful.
An unknown error occurred (-9808).

I have had this problem for awhile, as well.
Finally, after searching through all the forums, I have found something that works.
1) Go into your Internet Options
2) Click the Advanced tab
3) Scroll down to Security
4) Uncheck the box labeled "Check for server revocation certificate"

I recently switched to Norton 360 and none of the other fixes worked for me but this worked like a charm...thanks!!

Thanks! That helped me too!

what do i do if i'm using firefox as a default web browser?

I tried calling support, doing everything around... they ended up telling me to disconnect the iPhone and turn it off... then hold down the "home button" and keep it down while plugging the phone back into the computer... it'll restart itself and reinstall everything. When all that's done... it was SUPPOSED to fix itself... it didn't... so, I checked my time and date settings... turned out... my time/date was incorrect and that was the source of the whole problem. Try reinstalling the software and then check the time on your computer... it might help.

The most common google results for "itunes error 9808" is this, try it:

http://soccerislife8.blogspot.com/2008/02/itunes-error-9808.html

This did the trick for my -9808 error:
+make sure that the "Check for server certificate revocation (requires restart)" is unchecked+

Thank you for this information. I have been working with Norton for hours to get it working again and nothing they did worked. I followed the steps you listed and fixed in in less than a minute!!! Thank you again.

Thank you so much for the suggestion to uncheck the "server revocation" box - worked straight away, and I'd been struggling with it for days! Thanks again 🙂