I set up a distributed monitoring using multisite; I have multiple remote 
sites, each monitoring a number of hosts and services, and a "viewing" site, 
which just reads the values from the remote sites and makes their check results 

If the remote site is up and the host of the remote site is pingable everything 
works fine (as expected).

If the remote (omd-)site is down but the host of the remote site is pingable: 
site is shown as "dead" (as expected).

If the host of the remote site is physically disconnected (can't be pinged), 
the viewing site times out completely, regardless if there are other remote 
sites still reachable (and the viewing site could show those, at least).

I expected the disconnected site to display as "dead".

Excerpt from multisite.mk of the viewing site:


# Sites to connect to. If this variable is unset, a single # connection to the 
local host is done.

sites = {

    "REMOTEA" : {

        "alias" : "Remote site 1",

        "socket" : "tcp:",

       "url_prefix" : "/remotea/",


    "REMOTEB" : {

        "alias" : "Remote site 2",

        "socket" : "tcp:",

       "url_prefix" : "/remoteb/",


    "REMOTEC" : {

        "alias" : "Remote site 3",

        "socket" : "tcp:",

       "url_prefix" : "/remotec/",



Error Message when retrieving the dashboard of the viewing site (named 
"nagios")is "Proxy Error The proxy server received an invalid response from an 
upstream server.

The proxy server could not handle the request GET /nagios/check_mk/dashboard.py.

Reason: Error reading from remote server

Apache/2.2.15 (CentOS) Server at <hostname> Port 80"


1) Did I misconfigure something or is this known behavior?

2) Is there a workaround that the unreachable site is considered "dead" instead 
of timing out my viewing site?

Best regards,

www.plath.de  |  www.plathgroup.com
Amtsgericht Hamburg HRB 7401
Geschäftsführer: Dipl.-Kfm. Nico Scharfe (Vorsitzender), Dipl.-Kfm. Hinrich 

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