Need help for snmpset

Hi,

I need help. I adds new private mib process module to snmp agent, and
successfully bulid it into snmpd.

But I have problem when I use snmpset to set a data to snmp agent. I run
snmpd(snmp agent) on pc whose IP address is 10.48.138.84, and run
snmpset on other snmp client whose IP is 10.48.138.85. snmpset give
error shown below

# snmpset -v 2c -On -c public 10.48.138.84
.1.3.6.1.4.1.171.12.56.3.2.1.2 i 2
Error in packet.                                          
Reason: noAccess

But when I run snmpset on pc which run snmpd, it is no error

#snmpset -v 2c -On -c public localhost .1.3.6.1.4.1.171.12.56.3.2.1.2 i
2
.1.3.6.1.4.1.171.12.56.3.2.1.2 = INTEGER: 2

I thinks it maybe snmpd do not let other snmp client to write except
localhost. But I changed the /etc/snmp/snmpd.conf like below to let
10.48.138.85 have a writable right(I think). But, it does not work, and
have same error like "noAccess".

Could you give me some advice, tell me what wrong? Thanks ! 

/etc/snmp/snmpd.conf
...
#       sec.name  source          community
#com2sec notConfigUser  default       public
com2sec local          localhost     public
com2sec mynetwork      10.48.138.85  public
#com2sec mynetwork      10.48.137.0/24 public
#com2sec mynetwork      10.48.138.0/24 public
####
# Second, map the security name into a group name:

#       groupName      securityModel securityName
group   MyRWGroup    v1           mynetwork
group   MyRWGroup    v2c          mynetwork
group   MyRWGroup    usm          mynetwork
group   MyRWGroup    v1           local
group   MyRWGroup    v2c          local
group   MyRWGroup    usm          local
####
# Third, create a view for us to let the group have rights to:

# Make at least  snmpwalk -v 1 localhost -c public system fast again.
#       name           incl/excl     subtree         mask(optional)
#view    systemview    included   .1.3.6.1.2.1.1
#view    systemview    included   .1.3.6.1.2.1.25.1.1
view all    included  .1                               80

####
# Finally, grant the group read-only access to the systemview view.

#       group          context sec.model sec.level match     read
write  notif
access  MyRWGroup      ""      any       noauth    exact     all    all
none

....

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