RE: [cobalt-users] Server not reachable via GUI after putting it behind a Loadbalancer

["Gavin Nelmes-Crocker" <cobalt@xxxxxxxxxxxxxxxx>]

> I have a strange problem. We want to host some webservers (RaQ4's) in one
> dedicated network. For a better performance we want to implement an Load
> Balancer into this network, which uses NAT to translate the IP's
> to private
> IP's.
> On the servers we used private IP's (192.168 .....), so when someone wants
> to connect to the machine via the public ip (for example
> 123.456.789) the IP
> is translated to 192.168.0.1 and vice versa.
> It seems, that there are no problems first (FTP and SSH works super) but
> when I try to connect the Server via a browser, I got no answer, just the
> default Browser Screen, that the server hadn't been found.
> Can someone help me, where to edit some conf'S that the machine is Serving
> the HTTP Requests ?
> We use no accesslists on the Loadbalancer and ussing telnet on
> the public ip
> port 80 gives fine results.

Torsten

As I used to work for Cobalt and now work for a high availability company
part of which involves load balancing I think I have seen the problem
before.  First of all make sure you have DNS records set up for the server -
Cobalts don't like accessing by ip they do rewrites the only way round this
I know of is to use the full gui url

http://www.site.com:81/.cobalt/sysManage/index.html replacing www.site.com
with your site name or ip number. If this allows you to get to the admin GUI
then your answer is DNS.  I'm presuming that you have no rules as such that
might block specific ports you might need to specify some ports i.e. port 81
for gui and port 443 if using SSL.  This may not affect you (our unit has a
firewall built in and needs to be configured) it depends on the load
balancer used and no I'm not an expect on other peoples LBS

I presume in all of this that you can get to http I see that you can telnet
to it but can you browse to it?

Hope this gives you some pointers.

Regards

Gavin
ps I am happy to discuss LBS in general and specific to the company I work
for strictly off list if interested.