OK, I have just checked the crt file, it is valid till July 2009.
How comes I am still getting the problem? This only happens on BOINCpe machines. Regular windows machines with harddrives do not have this problem.

I am sorry, I just realized how to check the CRT file for expiration date. As stated above, it does not expire until june 2009.

The following is my BOINC log right after I added WCG project:

2/29/2008 7:38:17 PM||Fetching configuration file from http://www.worldcommunitygrid.org/get_project_config.php
2/29/2008 7:38:30 PM|World Community Grid|Master file download succeeded
2/29/2008 7:38:35 PM|World Community Grid|Sending scheduler request: Project initialization. Requesting 1 seconds of work, reporting 0 completed tasks
2/29/2008 7:38:37 PM||Project communication failed: attempting access to reference site
2/29/2008 7:38:38 PM||Access to reference site succeeded - project servers may be temporarily down.
2/29/2008 7:38:40 PM|World Community Grid|Scheduler request failed: Peer certificate cannot be authenticated with known CA certificates


Again, this ONLY happens when I use BOINCpe. It runs OK when I have it on Windows XP on a harddrive.

Here is the COMPLETE messages from BOINC startup.

3/19/2008 12:18:57 AM||Starting BOINC client version 5.10.28 for windows_intelx86
3/19/2008 12:18:57 AM||log flags: task, file_xfer, sched_ops
3/19/2008 12:18:57 AM||Libraries: libcurl/7.17.0 OpenSSL/0.9.8e zlib/1.2.3
3/19/2008 12:18:57 AM||Data directory: B:\BOINC\Data
3/19/2008 12:18:57 AM||Processor: 2 GenuineIntel Intel(R) Pentium(R) Dual  CPU  E2180  @ 2.00GHz [x86 Family 6 Model 15 Stepping 13]
3/19/2008 12:18:57 AM||Processor features: fpu tsc sse sse2 mmx
3/19/2008 12:18:57 AM||OS: Microsoft Windows XP: Professional Edition, (05.01.2600.00)
3/19/2008 12:18:57 AM||Memory: 1015.23 MB physical, 918.63 MB virtual
3/19/2008 12:18:57 AM||Disk: 254.00 MB total, 254.00 MB free
3/19/2008 12:18:57 AM||Local time is UTC +0 hours
3/19/2008 12:18:57 AM||No general preferences found - using BOINC defaults
3/19/2008 12:18:57 AM||Reading preferences override file
3/19/2008 12:18:57 AM||Preferences limit memory usage when active to 1015.23MB
3/19/2008 12:18:57 AM||Preferences limit memory usage when idle to 1015.23MB
3/19/2008 12:18:57 AM||Preferences limit disk usage to 0.25GB
3/19/2008 12:18:57 AM||This computer is not attached to any projects
3/19/2008 12:18:57 AM||Visit http://boinc.berkeley.edu for instructions
3/19/2008 12:20:07 AM||Fetching configuration file from http://www.worldcommunitygrid.org/get_project_config.php
3/19/2008 12:20:15 AM||Running CPU benchmarks
3/19/2008 12:20:15 AM||Suspending computation - running CPU benchmarks
3/19/2008 12:20:22 AM|World Community Grid|Master file download succeeded
3/19/2008 12:20:27 AM|World Community Grid|Sending scheduler request: Project initialization.  Requesting 1 seconds of work, reporting 0 completed tasks
3/19/2008 12:20:29 AM||A new version of BOINC (5.10.45) is available for your computer
3/19/2008 12:20:29 AM||Visit http://boinc.berkeley.edu/download.php to get it.
3/19/2008 12:20:29 AM||Project communication failed: attempting access to reference site
3/19/2008 12:20:30 AM||Access to reference site succeeded - project servers may be temporarily down.
3/19/2008 12:20:32 AM|World Community Grid|Scheduler request failed: Peer certificate cannot be authenticated with known CA certificates
3/19/2008 12:20:47 AM||Benchmark results:
3/19/2008 12:20:47 AM||   Number of CPUs: 2
3/19/2008 12:20:47 AM||   2167 floating point MIPS (Whetstone) per CPU
3/19/2008 12:20:47 AM||   4866 integer MIPS (Dhrystone) per CPU
3/19/2008 12:20:48 AM||Resuming computation
3/19/2008 12:21:32 AM|World Community Grid|Sending scheduler request: Project initialization.  Requesting 1 seconds of work, reporting 0 completed tasks
3/19/2008 12:21:33 AM||Project communication failed: attempting access to reference site
3/19/2008 12:21:34 AM||Access to reference site succeeded - project servers may be temporarily down.
3/19/2008 12:21:37 AM|World Community Grid|Scheduler request failed: Peer certificate cannot be authenticated with known CA certificates

Hi chungenhung!
While waiting for Didactylos you might have a look at your clock settings.
I see in your log that you run at UTC+0. No problem with that except than, then, you should not be able to show a log of events starting at 12:18 AM UTC on March 19 in a message posted at 9:20 PM UTC on March 18.
Those certificate matters are often related to date/time discrepancies and I wonder if that could not be the case for you.

Cheers. Jean.

Do you use BOINC PE? It will help if you can provide a similar log to chungenhung's.

Thank you.