HelpMaster v17.x.x and above.
When configuring the HelpMaster web portal using the IIS "Host Name" under Site Bindings, due to Microsoft .Net Framework security enhancements since Dot.Net Framework v4.5 the host names used must be added to a registry key to allow their usage. The IIS "Host Name" corresponds to the internal or external url address used to browse to the web portal e.g. Http://[HostName], and may or may not correspond to a registered external domain name.
After deploying the web portal with a host name, browsing to the new web site may cause an error stating that the url (host name) cannot be resolved.
To cater for the security enhancement introduced in the Dot.Net Framework v4.5 and above versions, your IIS host name, IP address, registered domain name, machine name, FQDN, and/or alias needs to be added to a registry key on the IIS server hosting the HelpMaster Web Module as follows;
1. Click Start, click Run, type 'regedit', and then click OK,
2. In Registry Editor, navigate to the following registry key: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa\MSV1_0,
3. Right-click MSV1_0, point to New, and then click Multi-String Value,
4. Type BackConnectionHostNames, and then press ENTER,
5. Right-click BackConnectionHostNames, and then click Modify,
6. In the Value data box, type the host name or the host names for the sites (all host names that may be used in the request URL) of the local computer, each on a new line and then click OK,
7. Quit Registry Editor, and then restart the workstation or server. The problem will not be resolved until the machine has been restarted.
Internet Explorer settings - http://www.helpmasterpro.com/Community/Discussion-Board/aft/126.aspx#126
Microsoft MSDN article - http://msdn.microsoft.com/en-us/library/cc982052%28v=vs.90%29.aspx
Microsoft Knowledge Base article - http://support.microsoft.com/kb/896861