snmpwalk to remote address gives timeout

["Bart" <schoft@hotmail.com>]

I have 2 debian boxes, one at stable, the other one at testing.

If i run "snmpwalk -v 1 -c public localhost system" at the testing box
I get the results I expect:
SNMPv2-MIB::sysDescr.0 = STRING: Linux Box2 2.6.19.061203 #1 Sun Dec 3
15:32:44 CET 2006 i686
SNMPv2-MIB::sysObjectID.0 = OID: NET-SNMP-MIB::netSnmpAgentOIDs.10
DISMAN-EVENT-MIB::sysUpTimeInstance = Timeticks: (493706) 1:22:17.06
SNMPv2-MIB::sysContact.0 = STRING: Root <root@localhost> (configure
/etc/snmp/snmpd.local.conf)
...
[snip]

However if I run "snmpwalk -v 1 -c public 192.168.1.36 system" on the
stable box, with 192.168.1.36 the IP address of the testing box, i get:
Timeout: No Response from 192.168.1.36

snmpd is up and running, I can ping both ways, there are no firewalls
in place. What could be wrong?

Stable uses NET-SNMP version: 5.1.2, testing NET-SNMP version: 5.2.3.
snmpd.conf on testing reads:
#
com2sec readonly  default         public
#
group MyROSystem v1        paranoid
group MyROSystem v2c       paranoid
group MyROSystem usm       paranoid
group MyROGroup v1         readonly
group MyROGroup v2c        readonly
group MyROGroup usm        readonly
group MyRWGroup v1         readwrite
group MyRWGroup v2c        readwrite
group MyRWGroup usm        readwrite
#
view all    included  .1                               80
view system included  .iso.org.dod.internet.mgmt.mib-2.system
#
access MyROSystem ""     any       noauth    exact  system none   none
access MyROGroup ""      any       noauth    exact  all    none   none
access MyRWGroup ""      any       noauth    exact  all    all    none