My Mars unit was crunching happily C4CW exclusively without problems for eight consecutive days. Then I got exclusively errors, at such a high rate that the maximum daily limit was passed and WCG servers stopped sending any unit. As I was on travel I could not do anything except switching it to another project which is what I did.

Now back at home I could not understand what was the difference in the WU's that generated errors. Both WUs are target 02. But is there anythig else?
Here under you have a log of the first error:

**************************
Result Log

Result Name: c4cw_ target02_ 003144713_ 0--



<core_client_version>6.10.58</core_client_version>
<![CDATA[
<message>
CreateProcess() failed - Acc refus (0x5)
</message>
]]>

******************************


And here the log of the last valid WU


*****************************
Result Log

Result Name: c4cw_ target02_ 003017671_ 0--



<core_client_version>6.10.58</core_client_version>
<![CDATA[
<stderr_txt>
Commandline = projects/www.worldcommunitygrid.org/wcg_c4cw_lmps_6.13_windows_intelx86 -screen none -in in.wcg.acc -var wcgsteps1 1000 -var wcgsteps2 10000 -var loop 0 -var restart 0 -var rinterval 100 -var ifile in.wcg.acc -var wcgseed 3017671
[14:39:36] Percent complete = 0.909008
[14:41:21] Percent complete = 1.818017
[14:43:08] Percent complete = 2.727025
[14:44:52] Percent complete = 3.636033
[14:46:41] Percent complete = 4.545041
[14:48:26] Percent complete = 5.454050
[14:50:12] Percent complete = 6.363058
[14:51:56] Percent complete = 7.272066
[14:53:39] Percent complete = 8.181074
[14:55:27] Percent complete = 9.090083
[14:55:32] Percent complete = 9.099173
[14:57:20] Percent complete = 9.999091
[14:59:06] Percent complete = 10.908099
[15:00:52] Percent complete = 11.817108
[15:02:37] Percent complete = 12.726116
[15:04:21] Percent complete = 13.635124
[15:06:06] Percent complete = 14.544132
[15:07:52] Percent complete = 15.453141
[15:09:38] Percent complete = 16.362149
[15:11:24] Percent complete = 17.271157
[15:13:10] Percent complete = 18.180165
[15:14:58] Percent complete = 19.089174
[15:16:47] Percent complete = 19.998182
[15:18:36] Percent complete = 20.907190
[15:20:21] Percent complete = 21.816199
[15:22:07] Percent complete = 22.725207
[15:23:54] Percent complete = 23.634215
[15:25:41] Percent complete = 24.543223
[15:27:30] Percent complete = 25.452232
[15:29:16] Percent complete = 26.361240
[15:31:04] Percent complete = 27.270248
[15:32:54] Percent complete = 28.179256
[15:34:41] Percent complete = 29.088265
[15:36:29] Percent complete = 29.997273
[15:38:14] Percent complete = 30.906281
[15:39:59] Percent complete = 31.815290
[15:41:45] Percent complete = 32.724298
[15:43:31] Percent complete = 33.633306
[15:45:17] Percent complete = 34.542314
[15:47:04] Percent complete = 35.451323
[15:48:53] Percent complete = 36.360331
[15:50:39] Percent complete = 37.269339
[15:52:25] Percent complete = 38.178347
[15:54:13] Percent complete = 39.087356
[15:56:02] Percent complete = 39.996364
[15:57:48] Percent complete = 40.905372
[15:59:33] Percent complete = 41.814381
[16:01:18] Percent complete = 42.723389
[16:03:05] Percent complete = 43.632397
[16:04:51] Percent complete = 44.541405
[16:06:39] Percent complete = 45.450414
[16:08:24] Percent complete = 46.359422
[16:10:11] Percent complete = 47.268430
[16:12:00] Percent complete = 48.177438
[16:13:48] Percent complete = 49.086447
[16:15:37] Percent complete = 49.995455
[16:17:22] Percent complete = 50.904463
[16:19:08] Percent complete = 51.813472
[16:20:54] Percent complete = 52.722480
[16:22:39] Percent complete = 53.631488
[16:24:25] Percent complete = 54.540496
[16:26:09] Percent complete = 55.449505
[16:27:55] Percent complete = 56.358513
[16:29:46] Percent complete = 57.267521
[16:31:32] Percent complete = 58.176529
[16:33:18] Percent complete = 59.085538
[16:35:04] Percent complete = 59.994546
[16:36:50] Percent complete = 60.903554
[16:38:38] Percent complete = 61.812562
[16:40:24] Percent complete = 62.721571
[16:42:13] Percent complete = 63.630579
[16:43:59] Percent complete = 64.539587
[16:45:50] Percent complete = 65.448596
[16:47:36] Percent complete = 66.357604
[16:49:24] Percent complete = 67.266612
[16:51:11] Percent complete = 68.175620
[16:53:02] Percent complete = 69.084629
[16:54:48] Percent complete = 69.993637
[16:56:35] Percent complete = 70.902645
[16:58:21] Percent complete = 71.811653
[17:00:14] Percent complete = 72.720662
[17:02:00] Percent complete = 73.629670
[17:03:49] Percent complete = 74.538678
[17:05:34] Percent complete = 75.447687
[17:07:38] Percent complete = 76.356695
[17:09:24] Percent complete = 77.265703
[17:11:14] Percent complete = 78.174711
[17:13:03] Percent complete = 79.083720
[17:14:51] Percent complete = 79.992728
[17:16:35] Percent complete = 80.901736
[17:18:20] Percent complete = 81.810744
[17:20:06] Percent complete = 82.719753
[17:21:53] Percent complete = 83.628761
[17:23:42] Percent complete = 84.537769
[17:25:29] Percent complete = 85.446778
[17:27:14] Percent complete = 86.355786
[17:29:01] Percent complete = 87.264794
[17:30:46] Percent complete = 88.173802
[17:32:32] Percent complete = 89.082811
[17:34:19] Percent complete = 89.991819
[17:36:04] Percent complete = 90.900827
[17:37:52] Percent complete = 91.809835
[17:39:44] Percent complete = 92.718844
[17:41:29] Percent complete = 93.627852
[17:43:14] Percent complete = 94.536860
[17:44:58] Percent complete = 95.445869
[17:46:43] Percent complete = 96.354877
[17:48:30] Percent complete = 97.263885
[17:50:16] Percent complete = 98.172893
[17:52:10] Percent complete = 99.081902
[17:53:57] Percent complete = 99.990910
called boinc_finish

</stderr_txt>
]]>

*****************************************

Any ideas?