The availablity of the Host is Not Available

[mary nancy]

Hi

Can somebody tell me what could be the reason for the availablity of the server to be "NOT AVAILABLE". When the server is up and running...
We are able to ping the server.
the error is :
[B]Got empty string from [gva1054] IP [] Parameter [check_service[ftp]][/B
]

[mary nancy]

Hi anybody who can solve the above problem?????????????????

[elkor]

can the zabbix server look up the name?
have you tried connecting via IP?
is the entire host not responding as far as zabbix is concerned or just this item?

some more information may help shine some light on your problem.

[mary nancy]

The availablity of the Host is Not Available

HI

the entire host is not responding.....

10011 GVA019 - 10050 Monitored Available Change
10019 gva022 - 10050 Monitored Unknown Change
10010 GVA071 - 10050 Monitored Not available Timeout while connecting to [GVA071] Change
10012 GVA073 - 10050 Monitored Available Change
10013 gva1054 - 10050 Monitored Not available Got empty string from [gva1054] IP [] Parameter [check_service[ftp]] Change
10009 gva1060 - 10050 Monitored Not available Cannot connect to [gva1060] [Connection refused] Change
10018 GVA3006 - 10050 Monitored Not available Cannot connect to [GVA3006] [Connection refused]


This is the data drawn from the host configuration list,

if you require any more information. Please let me know


Regards
Nancy

[James Wells]

Greetings,

Mary, can you post the configuration file, as it exists on GVA1054, minus the ListenIP of course. Also, please double check that you don't have any firewalling enabled on GVA1054. Right off the bat, I suspect that you have network issue here.

[mary nancy]

Greetings,

Thanks for your suggestion. But there are no firewalls nor any network issue.
It is getting empty string from gva1054 ip[].
I have no idea to go any further. My implementation phase is stuck with this

Regards
Nancy

[mary nancy]

this is the configuration file:



# This is config file for zabbix_agentd
# To get more information about ZABBIX, go http://www.zabbix.com

############ GENERAL PARAMETERS #################

# List of comma delimited IP addresses of ZABBIX servers. No spaces allowed.
# First IP is used for sending active checks.

Server=127.0.0.1

# Server port for sending active checks

#ServerPort=10051

# Unique hostname. Required for active checks.

Hostname=localhost

# Listen port. Default is 10050

#ListenPort=10050

# IP address to bind agent
# If missing, bind to all available IPs

#ListenIP=127.0.0.1

# Number of pre-forked instances of zabbix_agentd.
# Default value is 5
# This parameter must be between 1 and 16

StartAgents=5

# How often refresh list of active checks. 2 minutes by default.

#RefreshActiveChecks=120

# Specifies debug level
# 0 - debug is not created
# 1 - critical information
# 2 - error information
# 3 - warnings (default)
# 4 - for debugging (produces lots of information)

DebugLevel=3

# Name of PID file

PidFile=/var/tmp/zabbix_agentd.pid

# Name of log file.
# If not set, syslog will be used

LogFile=/tmp/zabbix_agentd.log

# Spend no more than Timeout seconds on processing
# Must be between 1 and 30

Timeout=3

##### Experimental options. Use with care ! #####

# Get rid of sockets in TIME_WAIT state
# This will set socket option SO_LINGER

# NoTimeWait=1

##### End of experimental options

####### USER-DEFINED MONITORED PARAMETERS #######
# Format: UserParameter=<key>,<shell command>
# Note that shell command must not return empty string or EOL only

#UserParameter=system[test],who|wc -l

### Set of parameter for monitoring MySQL server (v3.23.42 and later)
### Change -u<username> and add -p<password> if required

#UserParameter=mysql[ping],mysqladmin -uroot ping|grep alive|wc -l
#UserParameter=mysql[uptime],mysqladmin -uroot status|cut -f2 -d":"|cut -f1 -d"T"
#UserParameter=mysql[threads],mysqladmin -uroot status|cut -f3 -d":"|cut -f1 -d"Q"
#UserParameter=mysql[questions],mysqladmin -uroot status|cut -f4 -d":"|cut -f1 -d"S"
#UserParameter=mysql[slowqueries],mysqladmin -uroot status|cut -f5 -d":"|cut -f1 -d"O"
#UserParameter=mysql[qps],mysqladmin -uroot status|cut -f9 -d":"
#UserParameter=version[mysql],mysql -V

[James Wells]

Okay. Based on the configuration file, it looks like your issue is with the security function.

In the configuration file you are showing, you are listening to all network connections on port 10050, however, the only zabbix server that your agent will answer to is at 127.0.0.1. So what is happening is that your zabbix server does get a connection to the Zabbix agent, the server then sends the request for information, but by that time, the agent has already closed the connection. Please set the Server entry in the configuration file to be the correct IP address of the Zabbix server, restart the agent and try again.

[elkor]

What james said.

just got your email mary, sorry for the delay in response.

but as mentioned above the first thing is to let the agent actually accept incoming connections from the server.

although I must admit that it's unusual to get the message you are getting here, normally when this situation occurs the host status simply reads "cannot connect to [host] [connection refused]"

lets see what happens when we actually allow them to talk though.

[James Wells]

What james said.

just got your email mary, sorry for the delay in response.

but as mentioned above the first thing is to let the agent actually accept incoming connections from the server.

Hmmm, perhaps I was a bit unclear. The Agent is listening, and it is allowing connections from any source, however, once it recieves a connection, it processes the IP address of the source through the security check. If the source is not that of the entry(ies) listed on the Server line of the configuration file, it will immediatly close the connection.

This is what happens when you attempt to connection to an agent that is not listening on the IP that you are connecting to;

Trying 10.1.0.204...
telnet: connect to address 10.1.0.204: Connection refused

When this happens the sever will post the connection refused error, as you stated, however, what I suspect is happening to her is this;

Trying 10.1.0.204...
Connected to 10.1.0.204.
Escape character is '^]'.
Connection closed by foreign host.

In this case, you can see that we made a sucessful connection, but then the agent immediately killed the connection when we failed the security check.

[elkor]

mary's screenshot:

[elkor]

Hmmm, perhaps I was a bit unclear. The Agent is listening, and it is allowing connections from any source, however, once it recieves a connection, it processes the IP address of the source through the security check. If the source is not that of the entry(ies) listed on the Server line of the configuration file, it will immediatly close the connection.

In this case, you can see that we made a sucessful connection, but then the agent immediately killed the connection when we failed the security check.

No no no, I understood you. I was simply simplifying, of course the tcp connection is made; in the past though even though this is the case when the agent terminates the connection based on the security settings, zabbix still displayed "connection refused" (even though this came from the app layer, not tcp)

I was slightly off though.. it displays the more appropriate "connection reset by peer" message under normal circumstances as the screenshot below illustrates:



I was just bringing attention to the fact that the error she was getting seemed... unusual

[Han]

cannot connect to host

Hello,

Can sombody help us white the following message.

status is ok but availability says cannot connect to (hostname).
Zabbix veriosn is beta 1.1

Kind regards

Han van Eijden