Why is services.exe changing the Event Log retention policy

To give Network Service read permission on the EventLog/Security key (as suggested by Firenzi and royrules22) follow instructions from http://geekswithblogs.net/timh/archive/2005/10/05/56029.aspx

1. Open the Registry Editor:
   1. Select Start then Run
   2. Enter regedt32 or regedit

2. Navigate/expand to the following key:

   HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Eventlog\Security

3. Right click on this entry and select Permissions

4. Add the Network Service user

5. Give it Read permission

UPDATE: The steps above are ok on developer machines, where you do not use deployment process to install application.
However if you deploy your application to other machine(s), consider to register event log sources during installation as suggested in SailAvid's and Nicole Calinoiu's answers.

I am using PowerShell function (calling in Octopus Deploy.ps1)

function Create-EventSources() {
    $eventSources = @("MySource1","MySource2" )
    foreach ($source in $eventSources) {
            if ([System.Diagnostics.EventLog]::SourceExists($source) -eq $false) {
                [System.Diagnostics.EventLog]::CreateEventSource($source, "Application")
            }
    }
}

A little modification made it for me.. Base recipe is as follows, you might need to add/modify some more to fit your needs.

$ ~ > cp $DJANGO_PATH/utils/translation/ myproject/utils/ -a

and make the modifications given below:

$ ~ > diff $DJANGO_PATH/utils/translation/trans_real.py myproject/utils/translation/trans_real.py  -u

--- utils/translation/trans_real.py     Wed Jan 20 05:07:46 2010
+++ myproject/utils/translation/trans_real.py    Wed Jan 20 04:51:39 2010
@@ -435,6 +435,9 @@
 endblock_re = re.compile(r"""^\s*endblocktrans$""")
 plural_re = re.compile(r"""^\s*plural$""")
 constant_re = re.compile(r"""_\(((?:".*?")|(?:'.*?'))\)""")

+jinja_block_re = re.compile(r"""^\s*trans(?:\s+|$)""")
+jinja_endblock_re = re.compile(r"""^\s*endtrans$""")

 def templatize(src):
     """
@@ -451,7 +454,7 @@
     for t in Lexer(src, None).tokenize():
         if intrans:
             if t.token_type == TOKEN_BLOCK:
-                endbmatch = endblock_re.match(t.contents)
+                endbmatch = jinja_endblock_re.match(t.contents)
                 pluralmatch = plural_re.match(t.contents)
                 if endbmatch:
                     if inplural:
@@ -485,7 +488,7 @@
         else:
             if t.token_type == TOKEN_BLOCK:
                 imatch = inline_re.match(t.contents)
-                bmatch = block_re.match(t.contents)
+                bmatch = jinja_block_re.match(t.contents)
                 cmatches = constant_re.findall(t.contents)
                 if imatch:
                     g = imatch.group(1)


$ ~ > cp $DJANGO_PATH/core/management/commands/makemessages.py myproject/myapp/management/commands/ 


$ ~/myproject/ > diff  $DJANGO_PATH/core/management/commands/makemessages.py main/management/commands/makemessages.py -u
--- /usr/lib/python2.5/site-packages/django/core/management/commands/makemessages.py    Wed Jan 20 05:08:37 2010
+++ main/management/commands/makemessages.py    Wed Jan 20 05:28:41 2010
@@ -56,7 +56,7 @@
     else:
         settings.configure(USE_I18N = True)

-    from django.utils.translation import templatize
+    from myproject.utils.translation import templatize

     if os.path.isdir(os.path.join('conf', 'locale')):
         localedir = os.path.abspath(os.path.join('conf', 'locale'))

then calling make messages as follows does the trick

$ ~/myproject/ > ./manage.py mymakemessages -l $LANGUAGE -e .jinja -v 2

my templates are named as templ_name.jinja, you'll need to replace .jinja in the command above with whatever extension you use for your template names.