Hi all, I'm getting the following message after enabling http debugging:

Sat 13 Oct 2012 08:55:39 AM CST | World Community Grid | [http] HTTP_OP::init_get(): https://download.worldcommunitygrid.org/boinc/download/hcc1_image03_6.56.tga
Sat 13 Oct 2012 08:55:39 AM CST | World Community Grid | Started download of hcc1_image03_6.56.tga
Sat 13 Oct 2012 08:55:40 AM CST | World Community Grid | [http] [ID#272] Info:  About to connect() to download.worldcommunitygrid.org port 443 (#1)
Sat 13 Oct 2012 08:55:40 AM CST | World Community Grid | [http] [ID#272] Info:    Trying 170.224.160.205...
Sat 13 Oct 2012 08:55:40 AM CST | World Community Grid | [http] [ID#272] Info:  Connected to download.worldcommunitygrid.org (170.224.160.205) port 443 (#1)
Sat 13 Oct 2012 08:55:40 AM CST | World Community Grid | [http] [ID#272] Info:  Connected to download.worldcommunitygrid.org (170.224.160.205) port 443 (#1)
Sat 13 Oct 2012 08:55:40 AM CST | World Community Grid | [http] [ID#272] Info:  successfully set certificate verify locations:
Sat 13 Oct 2012 08:55:40 AM CST | World Community Grid | [http] [ID#272] Info:    CAfile: /etc/ssl/certs/ca-certificates.crt
Sat 13 Oct 2012 08:55:40 AM CST | World Community Grid | [http] [ID#272] Info:    CApath: none
Sat 13 Oct 2012 08:55:40 AM CST | World Community Grid | [http] [ID#272] Info:  SSLv3, TLS handshake, Client hello (1):
Sat 13 Oct 2012 08:55:41 AM CST | World Community Grid | [http] [ID#272] Info:  Unknown SSL protocol error in connection to download.worldcommunitygrid.org:443
Sat 13 Oct 2012 08:55:41 AM CST | World Community Grid | [http] [ID#272] Info:  Closing connection #1
Sat 13 Oct 2012 08:55:41 AM CST | World Community Grid | [http] HTTP error: SSL connect error
Sat 13 Oct 2012 08:55:41 AM CST |  | Project communication failed: attempting access to reference site
Sat 13 Oct 2012 08:55:41 AM CST |  | [http] HTTP_OP::init_get(): http://www.google.com/
Sat 13 Oct 2012 08:55:41 AM CST | World Community Grid | Temporarily failed download of hcc1_image03_6.56.tga: transient HTTP error
Sat 13 Oct 2012 08:55:41 AM CST | World Community Grid | Backing off 4 hr 30 min 31 sec on download of hcc1_image03_6.56.tga
Sat 13 Oct 2012 08:55:41 AM CST |  | [http] [ID#0] Info:  Re-using existing connection! (#0) with host www.google.com
Sat 13 Oct 2012 08:55:41 AM CST |  | [http] [ID#0] Info:  Connected to www.google.com (74.125.224.114) port 80 (#0)
Sat 13 Oct 2012 08:55:41 AM CST |  | [http] [ID#0] Sent header to server: GET / HTTP/1.1
Sat 13 Oct 2012 08:55:41 AM CST |  | [http] [ID#0] Sent header to server: User-Agent: BOINC client (x86_64-pc-linux-gnu 7.0.25)
Sat 13 Oct 2012 08:55:41 AM CST |  | [http] [ID#0] Sent header to server: Host: www.google.com
Sat 13 Oct 2012 08:55:41 AM CST |  | [http] [ID#0] Sent header to server: Accept: */*
Sat 13 Oct 2012 08:55:41 AM CST |  | [http] [ID#0] Sent header to server: Accept-Encoding: deflate, gzip
Sat 13 Oct 2012 08:55:41 AM CST |  | [http] [ID#0] Sent header to server: Content-Type: application/x-www-form-urlencoded
Sat 13 Oct 2012 08:55:41 AM CST |  | [http] [ID#0] Sent header to server:
Sat 13 Oct 2012 08:55:42 AM CST |  | [http] [ID#0] Received header from server: HTTP/1.1 200 OK
Sat 13 Oct 2012 08:55:42 AM CST |  | [http] [ID#0] Received header from server: Date: Sat, 13 Oct 2012 00:55:42 GMT
Sat 13 Oct 2012 08:55:42 AM CST |  | [http] [ID#0] Received header from server: Expires: -1
Sat 13 Oct 2012 08:55:42 AM CST |  | [http] [ID#0] Received header from server: Cache-Control: private, max-age=0
Sat 13 Oct 2012 08:55:42 AM CST |  | [http] [ID#0] Received header from server: Content-Type: text/html; charset=ISO-8859-1
Sat 13 Oct 2012 08:55:42 AM CST |  | [http] [ID#0] Received header from server: Set-Cookie: PREF=ID=b21357e8c8afd61b:FF=0:TM=1350089742:LM=1350089742:S=dN8do6I5NKAl0l0a; expires=Mon, 13-Oct-2014 00:55:42 GMT; path=/; domain=.google.com
Sat 13 Oct 2012 08:55:42 AM CST |  | [http] [ID#0] Received header from server: Set-Cookie: NID=64=mxzN4b77QZLLjuyJkiI22yOt6Ve7lz5myKgx10uTtNmMx7XJdXqQ3JSTvGlASpdw4X-nb44srVuBBq0W0_I1aSIq_rFuPyyUjHcHWfXEnjs6XUlkc1XprTBGLgvPYnPV; expires=Sun, 14-Apr-2013 00:55:42 GMT; path=/; domain=.google.com; HttpOnly
Sat 13 Oct 2012 08:55:42 AM CST |  | [http] [ID#0] Received header from server: P3P: CP="This is not a P3P policy! See http://www.google.com/support/accounts/bin/answer.py?hl=en&answer=151657 for more info."
Sat 13 Oct 2012 08:55:42 AM CST |  | [http] [ID#0] Received header from server: Server: gws
Sat 13 Oct 2012 08:55:42 AM CST |  | [http] [ID#0] Received header from server: X-XSS-Protection: 1; mode=block
Sat 13 Oct 2012 08:55:42 AM CST |  | [http] [ID#0] Received header from server: X-Frame-Options: SAMEORIGIN
Sat 13 Oct 2012 08:55:42 AM CST |  | [http] [ID#0] Received header from server: Transfer-Encoding: chunked
Sat 13 Oct 2012 08:55:42 AM CST |  | [http] [ID#0] Received header from server:
Sat 13 Oct 2012 08:55:42 AM CST |  | [http] [ID#0] Info:  Connection #0 to host www.google.com left intact
Sat 13 Oct 2012 08:55:42 AM CST |  | Internet access OK - project servers may be temporarily down.

Seems like a certification problem, but how can I solve it? Thanks for any ideas.

You have trouble downloading from WCG, so you best ask about that on their own forums. When you have trouble with a project, you first ask them, that's the quickest way to get things solved.

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Thanks, I've got it solved after posting [1] to the WCG forums as you suggested.

[1] https://secure.worldcommunitygrid.org/forums/wcg/viewthread_thread,34029