[mrtg] windows 2k3, snmp informant, snmp 2c, data not eval error

[garcetto]

hi to all.
we have many windows 2003 servers with snmp informant installed (easier to
get OID on win:), we are monitoring cpu, mem, disk, and all the rest with
success.
recently i noticed that every time the gigabit network interfaces of the
servers reach the full usage speed, i found on the log of my mrtg server the
message:
"2009-07-17 17:41:05 -- 2009-07-17 17:41:02: ERROR:
Target[procos11.lan1][_IN_] ' $target->[38]{$mode} ' did not eval into
defined data"

that means to me that if mrtg (that, for info, is a w2k server) read a very
high value it display this error.
during low network traffic i can see the correct graphs...
i used snmpwalk to check snmp v1 and v2 those servers and it respond
successfully, so i tryed without success to add ":::::2" code to mrtg config
file for those server oid interfaces, it does not work anyway.

so i am basically stuck...if the network card goes faster that 100Mb/sec, it
does not record the data, if i switch mrtg to snmp 2c with ":::::2" it gives
me this error

"2009-07-17 17:50:56 -- SNMP Error:
Received SNMP response with error code
 error status: genErr
 index 2 (OID:
1.3.6.1.4.1.9600.1.1.3.1.3.53.66.114.111.97.100.99.111.109.32.66.67.77.53.55.48.56.83.32.78.101.116.88.116.114.101.109.101.32.73.73.32.71.105.103.69.32.91.78.68.73.83.32.86.66.68.32.67.108.105.101.110.116.93)
SNMPv1_Session (remote host: "10.0.0.11" [10.0.0.11].161)
 community: "snmp4procos"
 request ID: 487209239
 PDU bufsize: 8000 bytes
 timeout: 2s
 retries: 5
 backoff: 1)
 at c:/mrtg/bin\..\lib\mrtg2/SNMP_util.pm line 492
"

can someone give me a clue? thx!
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