diff --git a/plugins/other/snmp__fn b/plugins/other/snmp__fn
index 5b3b9dd3..b481995a 100755
--- a/plugins/other/snmp__fn
+++ b/plugins/other/snmp__fn
@@ -12,6 +12,7 @@
 #
 # Version:     v1.00 30.10.2011 First draft of the fortigate plugin
 #              v1.01 19.01.2012 OID to MIB changed, plugins gets faster
+#              v1.02 25.01.2012 MIB file availability check added
 #
 # Parameters:  config   (required)
 #              autoconf (optional)
@@ -28,7 +29,7 @@
 # Fortigate    Activate snmp on your Fortigate firewall. Fortigate documentation
 #              at  https://support.fortinet.com 
 #
-# MIB          Download and copy the Fortigate MIB defintion file to 
+# MIB          Download and copy the original Fortigate MIB defintion file to 
 #              /usr/share/snmp/mibs/FORTINET-300-MIB.txt (Filename depends on
 #              used Version)
 #
@@ -45,8 +46,12 @@
 SNMPCLIENT=`basename $0 | sed 's/^snmp_//g' | cut -d "_" -f1`
 MIBFILE="/usr/share/snmp/mibs/FORTINET-300-MIB.20080414.txt"
 FNTYPE=`echo $MIBFILE | cut -d "." -f1 | cut -d "/" -f6`
-SNMPGET="/usr/bin/snmpget -m $MIBFILE  -c $community -v 2c $SNMPCLIENT"
-
+if [ -r $MIBFILE ]; then
+ SNMPGET="/usr/bin/snmpget -m $MIBFILE  -c $community -v 2c $SNMPCLIENT"
+else
+ echo no, MIB definition file not available or readable.
+ exit 1
+fi
 
 ### Variables ------------------------------------------------------------------
 fnSysVersion="1.3.6.1.4.1.12356.1.3.0"
@@ -57,10 +62,9 @@ fnSysSesCount="$FNTYPE::fnSysSesCount.0"
 fnVPNSslStatsLoginUsers="$FNTYPE::fnVpnSslStatsLoginUsers.1"
 fnVPNSslStatsActiveWebSessions="$FNTYPE::fnVpnSslStatsActiveWebSessions.1"
 fnVPNSslStatsActiveTunnels="$FNTYPE::fnVpnSslStatsActiveTunnels.1"
-mibfile="/usr/share/snmp/mibs/FORTINET-300-MIB.20080414.txt"
 
-UNIT=`$SNMPGET $fnSysVersion | cut -d ":" -f4 | cut -d " " -f2 | cut -d "\"" -f2`
-SCPU=`$SNMPGET $FGTcpu       | cut -d ":" -f4 | cut -d " " -f2`
+UNIT=`$SNMPGET $fnSysVersion  | cut -d ":" -f4 | cut -d " " -f2 | cut -d "\"" -f2`
+SCPU=`$SNMPGET $FGTcpu        | cut -d ":" -f4 | cut -d " " -f2`
 SMEM=`$SNMPGET $fnSysMemUsage | cut -d ":" -f4 | cut -d " " -f2`
 SCNT=`$SNMPGET $fnSysSesCount | cut -d ":" -f4 | cut -d " " -f2`
 USER=`$SNMPGET $fnVPNSslStatsLoginUsers | cut -d ":" -f4 | cut -d " " -f2`
@@ -86,7 +90,7 @@ autoconf()
           exit 1
     fi
     if [ $SCNT ]; then
-          echo yes, OID $fnSysSesCount can be read.
+          echo yes, OID $fnSysSesCount can be readed.
     else
           echo no, one or multiple OID can not be read.
           exit 1
@@ -107,7 +111,6 @@ config()
   echo 'forticpu.info CPU usage'
   echo 'forticpu.draw AREA'
   echo ''
-
   echo "multigraph fn_memory"
   echo "host_name $SNMPCLIENT"
   echo "graph_title $UNIT - Memory usage"