Windows 2008 R2 randomly non-responsive to SNMP queries

[reinaldo.gomes]

Since 4 or 5 months ago, I've been using SNMP queries to monitor the amount of memory used by some processes on all our remote servers, hosted on external datacenters.

2 weeks ago, some of our servers started to present timeout messages:

Code: Select all

ERROR: Process name table : No response from remote host 'xxx.xxx.xxx.xxx'.
ERROR: Alarm signal (Nagios time-out)

Sometimes this timeout message will linger for several hours up to a couple days. But eventually and without no apparent reason, it will return OK state and reset the timeout.

This only happens in 4 of our servers. They're all in the same datacenter's subnet and they are the only servers with "Windows Server 2008 R2 - Datacenter" Edition. That' all I have found in common between them problematica servers.

Some facts:

- other checks run normally on these problematic servers and won't timeout at all.
- other snmp checks, with different plugins, will timeout as often or so.
- I've contacted our datacenter but so far they haven't found anything that justifies this behavior.
- this happens with both v1 and v2c snmp.

I'm having a really hard time figuring out whether this is a network, windows or snmp-specific issue.
Any ideas?


edit: I ran Paessler's SNMP tester locally, and the output doesn't seem to differ between a problematic server an those running fine:

Code: Select all

Paessler SNMP Tester 5.1.3
31/08/2014 11:51:37 (1 ms) : Device: 
31/08/2014 11:51:37 (2 ms) : SNMP V1
31/08/2014 11:51:37 (3 ms) : Multiget Test 1
31/08/2014 11:51:37 (5 ms) : Single Get counter 1
31/08/2014 11:51:37 (7 ms) : GET: 1.3.6.1.2.1.2.2.1.10.1
31/08/2014 11:51:37 (8 ms) : Try 1
31/08/2014 11:51:37 (10 ms) : DoRequest 0
31/08/2014 11:51:37 (11 ms) : Init Session
31/08/2014 11:51:37 (13 ms) : Host: localhost
31/08/2014 11:51:37 (15 ms) : Timeout: 2000000
31/08/2014 11:51:37 (17 ms) : Version: 1
31/08/2014 11:51:37 (19 ms) : Open Session
31/08/2014 11:51:37 (22 ms) : Send Request
31/08/2014 11:51:37 (25 ms) : Send Done
31/08/2014 11:51:37 (28 ms) : Start 59411760
31/08/2014 11:51:39 (2036 ms) : Done 59411760 Status=2
31/08/2014 11:51:39 (2040 ms) : Result: -2003:#N
31/08/2014 11:51:39 (2043 ms) : 
31/08/2014 11:51:39 (2046 ms) : Multiget Test on counter 1
31/08/2014 11:51:39 (2049 ms) : 
31/08/2014 11:51:39 (2052 ms) : 1 OIDs
31/08/2014 11:51:39 (2055 ms) : GET List: 1.3.6.1.2.1.2.2.1.10.1=1.3.6.1.2.1.2.2.1.10.1
31/08/2014 11:51:39 (2058 ms) : Try 1
31/08/2014 11:51:39 (2061 ms) : DoRequest 0
31/08/2014 11:51:39 (2065 ms) : Init Session
31/08/2014 11:51:39 (2069 ms) : Host: localhost
31/08/2014 11:51:39 (2073 ms) : Timeout: 2000000
31/08/2014 11:51:39 (2077 ms) : Version: 1
31/08/2014 11:51:39 (2081 ms) : Open Session
31/08/2014 11:51:39 (2086 ms) : Send Request
31/08/2014 11:51:39 (2090 ms) : Send Done
31/08/2014 11:51:39 (2096 ms) : Start 59411760
31/08/2014 11:51:41 (4111 ms) : Done 59411760 Status=2
31/08/2014 11:51:41 (4114 ms) : Result: -2003
31/08/2014 11:51:41 (4117 ms) : 1.3.6.1.2.1.2.2.1.10.1: -2003 / #N
31/08/2014 11:51:41 (4120 ms) : 
31/08/2014 11:51:41 (4123 ms) : 2 OIDs
31/08/2014 11:51:41 (4126 ms) : GET List: 1.3.6.1.2.1.2.2.1.10.1=1.3.6.1.2.1.2.2.1.10.1,1.3.6.1.2.1.2.2.1.3.1=1.3.6.1.2.1.2.2.1.3.1
31/08/2014 11:51:41 (4129 ms) : Try 1
31/08/2014 11:51:41 (4135 ms) : DoRequest 0
31/08/2014 11:51:41 (4140 ms) : Init Session
31/08/2014 11:51:41 (4146 ms) : Host: localhost
31/08/2014 11:51:41 (4152 ms) : Timeout: 2000000
31/08/2014 11:51:41 (4158 ms) : Version: 1
31/08/2014 11:51:41 (4164 ms) : Open Session
31/08/2014 11:51:41 (4171 ms) : Send Request
31/08/2014 11:51:41 (4177 ms) : Send Done
31/08/2014 11:51:41 (4185 ms) : Start 59411760
31/08/2014 11:51:43 (6201 ms) : Done 59411760 Status=2
31/08/2014 11:51:43 (6207 ms) : Result: -2003
31/08/2014 11:51:43 (6212 ms) : 1.3.6.1.2.1.2.2.1.10.1: -2003 / #N
31/08/2014 11:51:43 (6217 ms) : 1.3.6.1.2.1.2.2.1.3.1: -2003 / #N
31/08/2014 11:51:43 (6222 ms) : 
31/08/2014 11:51:43 (6227 ms) : 3 OIDs
31/08/2014 11:51:43 (6233 ms) : GET List: 1.3.6.1.2.1.2.2.1.10.1=1.3.6.1.2.1.2.2.1.10.1,1.3.6.1.2.1.2.2.1.3.1=1.3.6.1.2.1.2.2.1.3.1,1.3.6.1.2.1.2.2.1.8.1=1.3.6.1.2.1.2.2.1.8.1
31/08/2014 11:51:43 (6237 ms) : Try 1
31/08/2014 11:51:43 (6243 ms) : DoRequest 0
31/08/2014 11:51:43 (6248 ms) : Init Session
31/08/2014 11:51:43 (6253 ms) : Host: localhost
31/08/2014 11:51:43 (6258 ms) : Timeout: 2000000
31/08/2014 11:51:43 (6263 ms) : Version: 1
31/08/2014 11:51:43 (6269 ms) : Open Session
31/08/2014 11:51:43 (6274 ms) : Send Request
31/08/2014 11:51:43 (6279 ms) : Send Done
31/08/2014 11:51:43 (6284 ms) : Start 59411760
31/08/2014 11:51:45 (8292 ms) : Done 59411760 Status=2
31/08/2014 11:51:45 (8299 ms) : Result: -2003
31/08/2014 11:51:45 (8306 ms) : 1.3.6.1.2.1.2.2.1.10.1: -2003 / #N
31/08/2014 11:51:45 (8314 ms) : 1.3.6.1.2.1.2.2.1.3.1: -2003 / #N
31/08/2014 11:51:45 (8323 ms) : 1.3.6.1.2.1.2.2.1.8.1: -2003 / #N
31/08/2014 11:51:45 (8330 ms) : 
31/08/2014 11:51:45 (8339 ms) : 4 OIDs
31/08/2014 11:51:45 (8347 ms) : GET List: 1.3.6.1.2.1.2.2.1.10.1=1.3.6.1.2.1.2.2.1.10.1,1.3.6.1.2.1.2.2.1.3.1=1.3.6.1.2.1.2.2.1.3.1,1.3.6.1.2.1.2.2.1.5.1=1.3.6.1.2.1.2.2.1.5.1,1.3.6.1.2.1.2.2.1.8.1=1.3.6.1.2.1.2.2.1.8.1
31/08/2014 11:51:45 (8355 ms) : Try 1
31/08/2014 11:51:45 (8364 ms) : DoRequest 0
31/08/2014 11:51:45 (8371 ms) : Init Session
31/08/2014 11:51:45 (8379 ms) : Host: localhost
31/08/2014 11:51:45 (8386 ms) : Timeout: 2000000
31/08/2014 11:51:45 (8395 ms) : Version: 1
31/08/2014 11:51:45 (8402 ms) : Open Session
31/08/2014 11:51:45 (8409 ms) : Send Request
31/08/2014 11:51:45 (8416 ms) : Send Done
31/08/2014 11:51:45 (8424 ms) : Start 59411760
31/08/2014 11:51:47 (10445 ms) : Done 59411760 Status=2
31/08/2014 11:51:47 (10462 ms) : Result: -2003
31/08/2014 11:51:48 (10476 ms) : 1.3.6.1.2.1.2.2.1.10.1: -2003 / #N
31/08/2014 11:51:48 (10490 ms) : 1.3.6.1.2.1.2.2.1.3.1: -2003 / #N
31/08/2014 11:51:48 (10505 ms) : 1.3.6.1.2.1.2.2.1.8.1: -2003 / #N
31/08/2014 11:51:48 (10520 ms) : 1.3.6.1.2.1.2.2.1.5.1: -2003 / #N
31/08/2014 11:51:48 (10533 ms) : 
31/08/2014 11:51:48 (10548 ms) : 5 OIDs
31/08/2014 11:51:48 (10564 ms) : GET List: 1.3.6.1.2.1.2.2.1.10.1=1.3.6.1.2.1.2.2.1.10.1,1.3.6.1.2.1.2.2.1.3.1=1.3.6.1.2.1.2.2.1.3.1,1.3.6.1.2.1.2.2.1.5.1=1.3.6.1.2.1.2.2.1.5.1,1.3.6.1.2.1.2.2.1.8.1=1.3.6.1.2.1.2.2.1.8.1,1.3.6.1.2.1.31.1.1.1.18.1=1.3.6.1.2.1.31.1.1.1.18.1
31/08/2014 11:51:48 (10579 ms) : Try 1
31/08/2014 11:51:48 (10595 ms) : DoRequest 0
31/08/2014 11:51:48 (10608 ms) : Init Session
31/08/2014 11:51:48 (10623 ms) : Host: localhost
31/08/2014 11:51:48 (10641 ms) : Timeout: 2000000
31/08/2014 11:51:48 (10653 ms) : Version: 1
31/08/2014 11:51:48 (10670 ms) : Open Session
31/08/2014 11:51:48 (10684 ms) : Send Request
31/08/2014 11:51:48 (10697 ms) : Send Done
31/08/2014 11:51:48 (10710 ms) : Start 59411760
31/08/2014 11:51:50 (12722 ms) : Done 59411760 Status=2
31/08/2014 11:51:50 (12736 ms) : Result: -2003
31/08/2014 11:51:50 (12749 ms) : 1.3.6.1.2.1.2.2.1.10.1: -2003 / #N
31/08/2014 11:51:50 (12763 ms) : 1.3.6.1.2.1.2.2.1.3.1: -2003 / #N
31/08/2014 11:51:50 (12776 ms) : 1.3.6.1.2.1.2.2.1.8.1: -2003 / #N
31/08/2014 11:51:50 (12791 ms) : 1.3.6.1.2.1.2.2.1.5.1: -2003 / #N
31/08/2014 11:51:50 (12804 ms) : 1.3.6.1.2.1.31.1.1.1.18.1: -2003 / #N
31/08/2014 11:51:50 (12817 ms) : 
31/08/2014 11:51:50 (12830 ms) : Reverse order *****************
31/08/2014 11:51:50 (12848 ms) : 
31/08/2014 11:51:50 (12861 ms) : 1 OIDs
31/08/2014 11:51:50 (12874 ms) : GET List: 1.3.6.1.2.1.31.1.1.1.18.1=1.3.6.1.2.1.31.1.1.1.18.1
31/08/2014 11:51:50 (12888 ms) : Try 1
31/08/2014 11:51:50 (12901 ms) : DoRequest 0
31/08/2014 11:51:50 (12916 ms) : Init Session
31/08/2014 11:51:50 (12930 ms) : Host: localhost
31/08/2014 11:51:50 (12946 ms) : Timeout: 2000000
31/08/2014 11:51:50 (12958 ms) : Version: 1
31/08/2014 11:51:50 (12970 ms) : Open Session
31/08/2014 11:51:50 (12982 ms) : Send Request
31/08/2014 11:51:50 (12995 ms) : Send Done
31/08/2014 11:51:50 (13007 ms) : Start 59411760
31/08/2014 11:51:52 (15031 ms) : Done 59411760 Status=2
31/08/2014 11:51:52 (15046 ms) : Result: -2003
31/08/2014 11:51:52 (15058 ms) : 1.3.6.1.2.1.31.1.1.1.18.1: -2003 / #N
31/08/2014 11:51:52 (15071 ms) : 
31/08/2014 11:51:52 (15084 ms) : 2 OIDs
31/08/2014 11:51:52 (15097 ms) : GET List: 1.3.6.1.2.1.2.2.1.5.1=1.3.6.1.2.1.2.2.1.5.1,1.3.6.1.2.1.31.1.1.1.18.1=1.3.6.1.2.1.31.1.1.1.18.1
31/08/2014 11:51:52 (15111 ms) : Try 1
31/08/2014 11:51:52 (15123 ms) : DoRequest 0
31/08/2014 11:51:52 (15144 ms) : Init Session
31/08/2014 11:51:52 (15160 ms) : Host: localhost
31/08/2014 11:51:52 (15178 ms) : Timeout: 2000000
31/08/2014 11:51:52 (15196 ms) : Version: 1
31/08/2014 11:51:52 (15215 ms) : Open Session
31/08/2014 11:51:52 (15233 ms) : Send Request
31/08/2014 11:51:52 (15253 ms) : Send Done
31/08/2014 11:51:52 (15266 ms) : Start 59411760
31/08/2014 11:51:54 (17278 ms) : Done 59411760 Status=2
31/08/2014 11:51:54 (17289 ms) : Result: -2003
31/08/2014 11:51:54 (17302 ms) : 1.3.6.1.2.1.31.1.1.1.18.1: -2003 / #N
31/08/2014 11:51:54 (17314 ms) : 1.3.6.1.2.1.2.2.1.5.1: -2003 / #N
31/08/2014 11:51:54 (17328 ms) : 
31/08/2014 11:51:54 (17342 ms) : 3 OIDs
31/08/2014 11:51:54 (17353 ms) : GET List: 1.3.6.1.2.1.2.2.1.5.1=1.3.6.1.2.1.2.2.1.5.1,1.3.6.1.2.1.2.2.1.8.1=1.3.6.1.2.1.2.2.1.8.1,1.3.6.1.2.1.31.1.1.1.18.1=1.3.6.1.2.1.31.1.1.1.18.1
31/08/2014 11:51:54 (17365 ms) : Try 1
31/08/2014 11:51:54 (17378 ms) : DoRequest 0
31/08/2014 11:51:54 (17390 ms) : Init Session
31/08/2014 11:51:54 (17403 ms) : Host: localhost
31/08/2014 11:51:54 (17414 ms) : Timeout: 2000000
31/08/2014 11:51:54 (17427 ms) : Version: 1
31/08/2014 11:51:54 (17440 ms) : Open Session
31/08/2014 11:51:54 (17454 ms) : Send Request
31/08/2014 11:51:54 (17465 ms) : Send Done
31/08/2014 11:51:54 (17479 ms) : Start 59411760
31/08/2014 11:51:57 (19493 ms) : Done 59411760 Status=2
31/08/2014 11:51:57 (19503 ms) : Result: -2003
31/08/2014 11:51:57 (19514 ms) : 1.3.6.1.2.1.31.1.1.1.18.1: -2003 / #N
31/08/2014 11:51:57 (19523 ms) : 1.3.6.1.2.1.2.2.1.5.1: -2003 / #N
31/08/2014 11:51:57 (19534 ms) : 1.3.6.1.2.1.2.2.1.8.1: -2003 / #N
31/08/2014 11:51:57 (19545 ms) : 
31/08/2014 11:51:57 (19560 ms) : 4 OIDs
31/08/2014 11:51:57 (19573 ms) : GET List: 1.3.6.1.2.1.2.2.1.3.1=1.3.6.1.2.1.2.2.1.3.1,1.3.6.1.2.1.2.2.1.5.1=1.3.6.1.2.1.2.2.1.5.1,1.3.6.1.2.1.2.2.1.8.1=1.3.6.1.2.1.2.2.1.8.1,1.3.6.1.2.1.31.1.1.1.18.1=1.3.6.1.2.1.31.1.1.1.18.1
31/08/2014 11:51:57 (19588 ms) : Try 1
31/08/2014 11:51:57 (19601 ms) : DoRequest 0
31/08/2014 11:51:57 (19618 ms) : Init Session
31/08/2014 11:51:57 (19632 ms) : Host: localhost
31/08/2014 11:51:57 (19648 ms) : Timeout: 2000000
31/08/2014 11:51:57 (19669 ms) : Version: 1
31/08/2014 11:51:57 (19683 ms) : Open Session
31/08/2014 11:51:57 (19697 ms) : Send Request
31/08/2014 11:51:57 (19714 ms) : Send Done
31/08/2014 11:51:57 (19728 ms) : Start 59411760
31/08/2014 11:51:59 (21739 ms) : Done 59411760 Status=2
31/08/2014 11:51:59 (21754 ms) : Result: -2003
31/08/2014 11:51:59 (21771 ms) : 1.3.6.1.2.1.31.1.1.1.18.1: -2003 / #N
31/08/2014 11:51:59 (21785 ms) : 1.3.6.1.2.1.2.2.1.5.1: -2003 / #N
31/08/2014 11:51:59 (21800 ms) : 1.3.6.1.2.1.2.2.1.8.1: -2003 / #N
31/08/2014 11:51:59 (21813 ms) : 1.3.6.1.2.1.2.2.1.3.1: -2003 / #N
31/08/2014 11:51:59 (21827 ms) : 
31/08/2014 11:51:59 (21840 ms) : 5 OIDs
31/08/2014 11:51:59 (21853 ms) : GET List: 1.3.6.1.2.1.2.2.1.10.1=1.3.6.1.2.1.2.2.1.10.1,1.3.6.1.2.1.2.2.1.3.1=1.3.6.1.2.1.2.2.1.3.1,1.3.6.1.2.1.2.2.1.5.1=1.3.6.1.2.1.2.2.1.5.1,1.3.6.1.2.1.2.2.1.8.1=1.3.6.1.2.1.2.2.1.8.1,1.3.6.1.2.1.31.1.1.1.18.1=1.3.6.1.2.1.31.1.1.1.18.1
31/08/2014 11:51:59 (21867 ms) : Try 1
31/08/2014 11:51:59 (21883 ms) : DoRequest 0
31/08/2014 11:51:59 (21898 ms) : Init Session
31/08/2014 11:51:59 (21912 ms) : Host: localhost
31/08/2014 11:51:59 (21928 ms) : Timeout: 2000000
31/08/2014 11:51:59 (21943 ms) : Version: 1
31/08/2014 11:51:59 (21956 ms) : Open Session
31/08/2014 11:51:59 (21971 ms) : Send Request
31/08/2014 11:51:59 (21985 ms) : Send Done
31/08/2014 11:51:59 (22001 ms) : Start 59411760
31/08/2014 11:52:01 (24017 ms) : Done 59411760 Status=2
31/08/2014 11:52:01 (24032 ms) : Result: -2003
31/08/2014 11:52:01 (24046 ms) : 1.3.6.1.2.1.31.1.1.1.18.1: -2003 / #N
31/08/2014 11:52:01 (24060 ms) : 1.3.6.1.2.1.2.2.1.5.1: -2003 / #N
31/08/2014 11:52:01 (24075 ms) : 1.3.6.1.2.1.2.2.1.8.1: -2003 / #N
31/08/2014 11:52:01 (24092 ms) : 1.3.6.1.2.1.2.2.1.3.1: -2003 / #N
31/08/2014 11:52:01 (24108 ms) : 1.3.6.1.2.1.2.2.1.10.1: -2003 / #N
31/08/2014 11:52:01 (24123 ms) : 
31/08/2014 11:52:01 (24138 ms) : OIDs 0+4
31/08/2014 11:52:01 (24151 ms) : GET List: 1.3.6.1.2.1.2.2.1.10.1=1.3.6.1.2.1.2.2.1.10.1,1.3.6.1.2.1.31.1.1.1.18.1=1.3.6.1.2.1.31.1.1.1.18.1
31/08/2014 11:52:01 (24166 ms) : Try 1
31/08/2014 11:52:01 (24179 ms) : DoRequest 0
31/08/2014 11:52:01 (24196 ms) : Init Session
31/08/2014 11:52:01 (24215 ms) : Host: localhost
31/08/2014 11:52:01 (24229 ms) : Timeout: 2000000
31/08/2014 11:52:01 (24244 ms) : Version: 1
31/08/2014 11:52:01 (24262 ms) : Open Session
31/08/2014 11:52:01 (24278 ms) : Send Request
31/08/2014 11:52:01 (24297 ms) : Send Done
31/08/2014 11:52:01 (24345 ms) : Start 59411760
31/08/2014 11:52:03 (26372 ms) : Done 59411760 Status=2
31/08/2014 11:52:03 (26386 ms) : Result: -2003
31/08/2014 11:52:03 (26399 ms) : 1.3.6.1.2.1.2.2.1.10.1: -2003 / #N
31/08/2014 11:52:03 (26412 ms) : 1.3.6.1.2.1.31.1.1.1.18.1: -2003 / #N
31/08/2014 11:52:03 (26426 ms) : 
31/08/2014 11:52:03 (26439 ms) : OIDs 3*0..2
31/08/2014 11:52:03 (26454 ms) : GET List: 1.3.6.1.2.1.2.2.1.10.1=1.3.6.1.2.1.2.2.1.10.1,1.3.6.1.2.1.2.2.1.3.1=1.3.6.1.2.1.2.2.1.3.1,1.3.6.1.2.1.2.2.1.8.1=1.3.6.1.2.1.2.2.1.8.1
31/08/2014 11:52:03 (26470 ms) : Try 1
31/08/2014 11:52:04 (26483 ms) : DoRequest 0
31/08/2014 11:52:04 (26498 ms) : Init Session
31/08/2014 11:52:04 (26512 ms) : Host: localhost
31/08/2014 11:52:04 (26526 ms) : Timeout: 2000000
31/08/2014 11:52:04 (26538 ms) : Version: 1
31/08/2014 11:52:04 (26554 ms) : Open Session
31/08/2014 11:52:04 (26569 ms) : Send Request
31/08/2014 11:52:04 (26584 ms) : Send Done
31/08/2014 11:52:04 (26600 ms) : Start 59411760
31/08/2014 11:52:06 (28619 ms) : Done 59411760 Status=2
31/08/2014 11:52:06 (28629 ms) : Result: -2003
31/08/2014 11:52:06 (28641 ms) : 1.3.6.1.2.1.2.2.1.10.1: 0 / 
31/08/2014 11:52:06 (28649 ms) : 1.3.6.1.2.1.2.2.1.3.1: 0 / 
31/08/2014 11:52:06 (28658 ms) : 1.3.6.1.2.1.2.2.1.8.1: 0 / 
31/08/2014 11:52:06 (28671 ms) : 1.3.6.1.2.1.2.2.1.10.1: 0 / 
31/08/2014 11:52:06 (28685 ms) : 1.3.6.1.2.1.2.2.1.3.1: 0 / 
31/08/2014 11:52:06 (28698 ms) : 1.3.6.1.2.1.2.2.1.8.1: 0 / 
31/08/2014 11:52:06 (28712 ms) : 1.3.6.1.2.1.2.2.1.10.1: -2003 / #N
31/08/2014 11:52:06 (28729 ms) : 1.3.6.1.2.1.2.2.1.3.1: -2003 / #N
31/08/2014 11:52:06 (28745 ms) : 1.3.6.1.2.1.2.2.1.8.1: -2003 / #N
31/08/2014 11:52:06 (28768 ms) : 
31/08/2014 11:52:06 (28793 ms) : All counter data
31/08/2014 11:52:06 (28798 ms) : GET List: 1.3.6.1.2.1.1.3.0=1.3.6.1.2.1.1.3.0,1.3.6.1.2.1.2.2.1.10.1=1.3.6.1.2.1.2.2.1.10.1,1.3.6.1.2.1.2.2.1.11.1=1.3.6.1.2.1.2.2.1.11.1,1.3.6.1.2.1.2.2.1.12.1=1.3.6.1.2.1.2.2.1.12.1,1.3.6.1.2.1.2.2.1.13.1=1.3.6.1.2.1.2.2.1.13.1,1.3.6.1.2.1.2.2.1.14.1=1.3.6.1.2.1.2.2.1.14.1,1.3.6.1.2.1.2.2.1.15.1=1.3.6.1.2.1.2.2.1.15.1,1.3.6.1.2.1.2.2.1.16.1=1.3.6.1.2.1.2.2.1.16.1,1.3.6.1.2.1.2.2.1.17.1=1.3.6.1.2.1.2.2.1.17.1,1.3.6.1.2.1.2.2.1.18.1=1.3.6.1.2.1.2.2.1.18.1,1.3.6.1.2.1.2.2.1.19.1=1.3.6.1.2.1.2.2.1.19.1,1.3.6.1.2.1.2.2.1.20.1=1.3.6.1.2.1.2.2.1.20.1
31/08/2014 11:52:06 (28806 ms) : Try 1
31/08/2014 11:52:06 (28814 ms) : DoRequest 0
31/08/2014 11:52:06 (28821 ms) : Init Session
31/08/2014 11:52:06 (28828 ms) : Host: localhost
31/08/2014 11:52:06 (28833 ms) : Timeout: 2000000
31/08/2014 11:52:06 (28838 ms) : Version: 1
31/08/2014 11:52:06 (28844 ms) : Open Session
31/08/2014 11:52:06 (28850 ms) : Send Request
31/08/2014 11:52:06 (28856 ms) : Send Done
31/08/2014 11:52:06 (28861 ms) : Start 59411760
31/08/2014 11:52:08 (30865 ms) : Done 59411760 Status=2
31/08/2014 11:52:08 (30871 ms) : Result: -2003
31/08/2014 11:52:08 (30877 ms) : 1.3.6.1.2.1.2.2.1.10.1: -2003 / #N
31/08/2014 11:52:08 (30882 ms) : 1.3.6.1.2.1.2.2.1.16.1: -2003 / #N
31/08/2014 11:52:08 (30887 ms) : 1.3.6.1.2.1.2.2.1.11.1: -2003 / #N
31/08/2014 11:52:08 (30893 ms) : 1.3.6.1.2.1.2.2.1.17.1: -2003 / #N
31/08/2014 11:52:08 (30898 ms) : 1.3.6.1.2.1.2.2.1.12.1: -2003 / #N
31/08/2014 11:52:08 (30904 ms) : 1.3.6.1.2.1.2.2.1.18.1: -2003 / #N
31/08/2014 11:52:08 (30910 ms) : 1.3.6.1.2.1.2.2.1.14.1: -2003 / #N
31/08/2014 11:52:08 (30916 ms) : 1.3.6.1.2.1.2.2.1.20.1: -2003 / #N
31/08/2014 11:52:08 (30921 ms) : 1.3.6.1.2.1.2.2.1.13.1: -2003 / #N
31/08/2014 11:52:08 (30926 ms) : 1.3.6.1.2.1.2.2.1.19.1: -2003 / #N
31/08/2014 11:52:08 (30933 ms) : 1.3.6.1.2.1.2.2.1.15.1: -2003 / #N
31/08/2014 11:52:08 (30937 ms) : 1.3.6.1.2.1.1.3.0: -2003 / #N

[tmcdonald]

I would lean more toward Windows/SNMP based upon the following:

http://support.microsoft.com/kb/980259

It's not 100% applicable, but I've found similar complaints about SNMP on Windows so it wouldn't surprise me if this was related.

However, the fact that the local SNMP tester seems to work all the time would point to a network error.

[reinaldo.gomes]

I would lean more toward Windows/SNMP based upon the following:

http://support.microsoft.com/kb/980259

I forgot to mention, I had already tried this, but to no avail. I created the registry entry as shown, then I restarted the server, then I tried to install the KB, but it said it wasn't suitable to my OS, even though I made sure to check the "Windows 7/WindowsServer 2008 R2" option. Maybe it has something to do with the "Datacenter" version, who knows.

However, the fact that the local SNMP tester seems to work all the time would point to a network error.

This, and the fact that the four affected machines are the only ones inside the same subnet in a given Datacenter. However, tech support didn't find anything that could help me on this.
Fully updating one of the servers via Windows Update didn't seem to help either.

Anyway, since last night, the timeout messages are significantly shorter in duration time, and I don't know exactly why.

[tmcdonald]

Are there any firewalls in place that might be rate-limiting or otherwise blocking too many SNMP queries in a given period? A lot of IDS/IPS will do this as a counter-measure to surveillance.