https/ssl for internal web/app servers

we have an ERP application that can only be accessed "internally" via the private network. However, when the users login, for some admin type activities they supply SQL credentials to access an admin area of the application. by reviewing the URL this is going over HTTP not HTTPS. I presume management dont see the risk that high as only internal hackers could "sniff" the traffic, but even so, still a degree of risk. What costs are involved in buying a certificate for an internal server to mitigate this risk? need to determine the costs vs benefits to see if management will pursue such a control to mitigate the credentials being passed over the network unencrypted. given our setup i suspect the liklehood of someone sniffing credentials in transit is very low, but always a possibility. if the fix is cheap £$ then they may pursue it. ( app with backend SQL server 2008 R2)
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The cost of an authority certificate is cheap ($20-$50), but that is only the start. If your webserver is not configured to server https, then you have to do that. In addition you have to install the certificate on the webserver.

Another choice for the certificate is a self signed certificate for free. Take a look at:

as an example. You still need to do the web server steps.

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pma111Author Commented:
>If your webserver is not configured to server https, then you have to do that. In addition you have to install the certificate on the webserver.

Does that involve more cost, or are you just referring to the admins time/labour to do the work? Is this a complex tasks for an admin, or relatively straight forward?
No cost, just configuring another instance of the web server that answers on port 443. If the person who installed the web server is familiar, then it is not a significant task to do that and install a certificate.
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