[SNMP4J] Agent / manager reconnect problem

[Frank Fock]

Jon,

I think I have fixed this problem in SNMP4J 1.10.1.
Please download SNMP4J-1.10.1-beta from
http://www.snmp4j.org/snmp4j-1.10.1-beta.zip
and compile your agent(s) against it and try to
reproduce the problem.

Please let me know if the problem persists or not.

Regards,
Frank

Railsback, Jonathan wrote:
> I have an SNMP manager that I wrote using SNMP4j, as well as a series of agents that I wrote using SNMP4j-Agent.
> 
> I am having a problem where I intermittently get the message <> after one of my agents restarts.
> 
> Here is a sample of the snmp agent's log after it has been stopped then restarted, showing the manager unable to get a response:
> 
> 51643 [DefaultUDPTransportMapping_192.168.41.133/9012] WARN org.snmp4j.MessageDispatcherImpl  - 1.3.6.1.6.3.15.1.1.2.0 = 3
> 54644 [DefaultUDPTransportMapping_192.168.41.133/9012] DEBUG org.snmp4j.transport.DefaultUdpTransportMapping  - Received message from /192.168.41.123/38251 with length 308: 30:82:01:30:02:01:03:30:11:02:04:73:9a:c1:75:02:03:00:ff:ff:04:01:07:02:01:03:04:35:30:33:04:06:c0:a8:29:65:5a:2a:02:01:01:02:02:00:ee:04:0a:61:67:65:6e:74:2d:75:73:65:72:04:0c:e9:7b:a3:5e:6d:1b:0b:30:bd:32:3c:29:04:08:00:00:00:01:dc:cb:d6:dc:04:81:e0:1a:09:05:4f:56:01:01:07:8c:7f:c5:62:1a:92:ad:31:14:d0:8d:ba:be:b5:6c:19:55:1a:9a:fa:18:34:2a:5a:5d:8d:69:aa:87:9b:87:7b:ff:96:98:b3:64:df:fc:81:e7:88:b0:72:1e:39:04:b1:38:51:54:00:40:96:b6:a6:8c:17:c3:c4:5d:fa:e6:aa:6c:6b:c9:43:bc:5e:b9:d6:ce:29:08:7d:16:ae:22:9c:33:1c:88:08:dd:5d:4e:10:6f:3f:21:a5:3a:ae:d3:fc:ac:ec:ed:6d:e2:f8:94:ee:de:ec:ae:08:b1:37:db:ba:99:27:3f:09:b2:bc:d9:73:7a:70:a4:9f:9f:0f:c4:28:a3:a8:d7:b4:7c:11:08:13:02:7c:be:4b:2f:83:f0:2a:76:3a:0a:89:1b:52:9e:ea:d5:c5:66:44:d6:5f:6e:04:85:70:e9:b5:e6:71:f8:ce:59:5b:7d:e2:64:fb:c3:f8:40:1e:7a:2
a:c3:c9:eb:91:0f:e8:05:05:d5:bd:9d:32:39:90:1d:8e:0a:fd:bd:22:57:50:ed:03:43:67:81:05:2d:30:52:12:4f:e4:e5:2b
> 54644 [DefaultUDPTransportMapping_192.168.41.133/9012] DEBUG org.snmp4j.mp.MPv3  - SNMPv3 header decoded: msgId=1939521909, msgMaxSize=65535, msgFlags=07, secModel=3
> 54644 [DefaultUDPTransportMapping_192.168.41.133/9012] DEBUG org.snmp4j.security.USM  - getUser(engineID=c0:a8:29:65:5a:2a, securityName=agent-user)
> 54644 [DefaultUDPTransportMapping_192.168.41.133/9012] DEBUG org.snmp4j.security.UsmTimeTable  - CheckTime: received message outside time window (authorative):183 > 150
> 54644 [DefaultUDPTransportMapping_192.168.41.133/9012] DEBUG org.snmp4j.security.USM  - RFC3414 §3.2.7.a Not in time window; engineID='c0:a8:29:65:5a:2a', engineBoots=1, engineTime=238
> 54645 [DefaultUDPTransportMapping_192.168.41.133/9012] DEBUG org.snmp4j.mp.MPv3  - Adding cache entry: StateReference[msgID=1939521909,pduHandle=PduHandle[815628490],securityEngineID=c0:a8:29:65:5a:2a,securityModel=org.snmp4j.security.USM at 10ffb38,securityName=agent-user,securityLevel=3,contextEngineID=,contextName=]
> 54645 [DefaultUDPTransportMapping_192.168.41.133/9012] DEBUG org.snmp4j.mp.MPv3  - Removed cache entry: StateReference[msgID=1939521909,pduHandle=PduHandle[815628490],securityEngineID=c0:a8:29:65:5a:2a,securityModel=org.snmp4j.security.USM at 10ffb38,securityName=agent-user,securityLevel=3,contextEngineID=,contextName=]
> 54645 [DefaultUDPTransportMapping_192.168.41.133/9012] DEBUG org.snmp4j.security.USM  - RFC3414 §3.1.4.b Outgoing message is not encrypted
> 54645 [DefaultUDPTransportMapping_192.168.41.133/9012] DEBUG org.snmp4j.transport.DefaultUdpTransportMapping  - Sending message to 192.168.41.123/38251 with length 106: 30:68:02:01:03:30:11:02:04:73:9a:c1:75:02:03:00:ff:ff:04:01:01:02:01:03:04:2c:30:2a:04:06:c0:a8:29:65:5a:2a:02:01:01:02:01:36:04:0a:61:67:65:6e:74:2d:75:73:65:72:04:0c:ad:fc:78:bc:be:1a:42:1a:3c:9a:03:3e:04:00:30:22:04:00:04:00:a8:1c:02:01:00:02:01:00:02:01:00:30:11:30:0f:06:0a:2b:06:01:06:03:0f:01:01:02:00:41:01:04
> 
> What is very confusing is that all the initial connections work correctly, every time.  It just seems to be reconnects that have intermittent issues.  Sometimes reconnects work, sometimes they dont.
> 
> Any help, tips, or other insight would be greatly appreciated!
> 
> Thanks,
> 
> Jon
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