HTTP Communication Errors
This page documents the various reasons you would receive an HTTP error and provides solutions. HTTP errors are for web-based services that Sierra Chart connects to. This applies to the Sierra Chart Login window and other services Sierra Chart connects with that also use HTTP.
HTTP (Hypertext transfer protocol) is a common protocol used on the Internet for websites.
The following are examples of HTTP communication errors displayed in the Window >> Message Log:
The following items below explain the different possible reasons for HTTP errors at the Sierra Chart Login window and displayed in the Message Log when using any of the HTTP services, and provides solutions.
1 - Internet Communication or Server Problem
There is a communication problem to the particular HTTP server being connected to or a problem with the server. In the case of when you receive an HTTP error when logging into Sierra Chart at the Login window, then if you can browse the this web site with your Web browser, then neither of these are the problem.
2 - Firewall (most likely)
A firewall on your computer is blocking Internet access from Sierra Chart. This has shown to be the reason for problems in almost all cases.
Make sure it does not block access and also try turning the firewall off completely. This does not apply to the standard Windows operating system firewall. That will not typically block access.
If you have upgraded the software, then some firewall programs will block Internet access! In this case what you need to do is allow Sierra Chart access through the firewall (you will need to consult with the firewall manual or their support department for instructions if you need help with this).
If you receive a Timeout or HTTP Error: The connection was closed before a response was received errors, then this is a very good indication a firewall program on your computer is blocking Internet access.
Solving firewall problems is something that Sierra Chart support cannot help with. Even if you believe your firewall is not the source of the problem, it likely is and you need to be aware of this and remove it if necessary. Firewalls are well known to cause connection problems and often be much more trouble than they are worth.
One solution to work around a firewall blocking Sierra Chart from logging in is to install a new copy of Sierra Chart into a different folder on your computer. This is one technique that might work around the firewall blocking access. Give this a try and if it works, you can transfer your data and settings over to the new copy of Sierra Chart by following the instructions in help topic 15.
Uninstalling a firewall does not necessarily mean that the firewall software is completely uninstalled. One way to not load a firewall is to restart your computer in Windows Safe Mode with Network Support. To do this, restart your computer and press the F8 key on your keyboard when Windows begins to load. This is the only definitive way to bypass a firewall.
3 - HTTP Proxy Server
Your network or ISP (Internet Service Provider) may require that you use a proxy server to access Web services on the Internet. This is most common at work location networks.
If you are unsure if your network/ISP uses a proxy server, then contact your network manager or ISP.
If a proxy server is required, then enable Use HTTP Proxy on the Sierra Chart Login window (refer to image below). Enter the proxy server address in the Address box. The proxy server must support SSL/TLS. A secure connection is required.
Enter the specific port number used by the proxy server in the Port box. The proxy server settings must be entered on the Sierra Chart Login window.
If you are unsure of the address or port, contact your network manager or your ISP.
4 - "Unknown Server Error" Message at Sierra Chart Login Window
When logging in at the Sierra Chart Login window, and you receive an "Unknown server error", then this means that the response received does not conform to the expected response. The usual reason for this is that it is required that you connect to websites through a proxy server.
Follow the HTTP Proxy Server instructions on this page to use a proxy server.
5 - Update Sierra Chart
Recent versions of Sierra Chart no longer use the Windows HTTP functions. Therefore it is important to make sure that Sierra Chart is up to date to avoid any problems caused by using the Windows HTTP functions. Follow the Fast Update instructions.
*Last modified Friday, 10th March, 2017.