I went here: http://www.dotsch.de/boinc/BOINC%20Clients.html and downloaded the Solaris x86 BOINC client v 6.12.26.

I went thru the docs, setup my account (already have a Linux server running BOINC for Linux, works fine).

When I do an update_prefs, then run boinc_client and get the below:

./boinc_client --update_prefs http://setiathome.berkeley.edu --no_gui_rpc
20-Feb-2013 15:57:17 [---] Starting BOINC client version 6.12.26 for x86_64-pc-solaris
20-Feb-2013 15:57:17 [---] log flags: file_xfer, sched_ops, task
20-Feb-2013 15:57:17 [---] Libraries: libcurl/7.18.0 OpenSSL/0.9.8p zlib/1.2.3
20-Feb-2013 15:57:17 [---] Data directory: /opt/boinc
20-Feb-2013 15:57:17 [---] Processor: 4 i86pc amd64
20-Feb-2013 15:57:17 [---] Processor features:
20-Feb-2013 15:57:17 [---] OS: SunOS: 5.10
20-Feb-2013 15:57:17 [---] Memory: 4.00 GB physical, 7.81 GB virtual
20-Feb-2013 15:57:17 [---] Disk: 38.48 GB total, 32.48 GB free
20-Feb-2013 15:57:17 [---] Local time is UTC -6 hours
20-Feb-2013 15:57:17 [---] No usable GPUs found
20-Feb-2013 15:57:17 [Einstein@Home] URL http://einstein.phys.uwm.edu/; Computer ID 6665931; resource share 100
20-Feb-2013 15:57:17 [SETI@home] URL http://setiathome.berkeley.edu/; Computer ID 6913846; resource share 100
20-Feb-2013 15:57:17 [---] No general preferences found - using BOINC defaults
20-Feb-2013 15:57:17 [---] Preferences:
20-Feb-2013 15:57:17 [---] max memory usage when active: 2047.78MB
20-Feb-2013 15:57:17 [---] max memory usage when idle: 3686.00MB
20-Feb-2013 15:57:17 [---] max disk usage: 10.00GB
20-Feb-2013 15:57:17 [---] don't use GPU while active
20-Feb-2013 15:57:17 [---] suspend work if non-BOINC CPU load exceeds 25 %
20-Feb-2013 15:57:17 [---] (to change preferences, visit the web site of an attached project, or select Preferences in the Manager)
20-Feb-2013 15:57:17 [---] Not using a proxy
Initialization completed
20-Feb-2013 15:57:19 [SETI@home] Sending scheduler request: Requested by user.
20-Feb-2013 15:57:19 [SETI@home] Not reporting or requesting tasks
20-Feb-2013 15:57:23 [SETI@home] Scheduler request completed
20-Feb-2013 15:57:23 [SETI@home] This project doesn't support computers of type x86_64-pc-solaris


Any clues as to how I can get this working?

Same site that you got the client from has executables for Seti.
See http://www.dotsch.de/boinc/SETI%40home%20applications.html, Solaris/OpenSolaris Binaries.

These then run through the anonymous platform. All you have to do is add the files in any of the archives into your BOINC\Projects\setiathome.berkeley.edu\ directory and start the client.

See the Doc directory in the archive.

The reason behind this is this, Seti (and most other projects, really) only has default applications for the most used OSes: Windows, Linux and Mac OS X. The project can't afford to make a binary of their science application(s) for each and every OS out there, so they released their source code that users can make a working binary out of for their OS of choice. Which is what happened here.

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So I cannot for example, join cosomology and others using the Solaris Client? Only Seti? Sorry..just need clarification.

No, you can't just join any project with that OS. You'd have to check the project's applications page to see which apps they support, or look for a third party (anonymous platform) application for those projects as well.

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So I cannot for example, join cosomology and others using the Solaris Client? Only Seti? Sorry..just need clarification.

You can join any project you want.....but if the project has no application for solaris_x86 you will not be able to get work.

So far as i know there are 4 projects with executables (available from third party sites) for solaris_x86: Seti, Simap, SubsetSum and Test4Theory. May be there are some more, but it is difficult to find.....