Cannot get user IP address (proxy/firewall/load balancer)
Problem solved by using HTTP_CLIENT_IP instead of REMOTE_ADDR in sourcecode files.
The problem about IIS Logs was solved by installing IIS Advanced Logging module as suggested here. Also I got error "503: Service Unavailable" after installing Advanced Logging but solved this by granting read-write permissions to Everyone for Program Files\IIS folder and started failed application pools.
Another solution suggested here is:
On the NetScaler under "load balancing", "Services" then under the advanced tab, under settings, check the box for "Use Source IP" and "Client IP" then in the Header field "CLIENT-IP"
HasanG
I love stack overflow! :) Hasan Gürsoy @ innovacube "As I always say; Every solution creates a new problem"
Updated on June 17, 2022Comments
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HasanG over 1 year
I used code below to get client ip with asp.net before but after I moved to VDS this function begin returning only my subnet mask which is 178.18.198.1 or 178.18.198.2. Can anyone help me with this problem?
Private Function GetIPAddress() As String Dim sIPAddress As String = Nothing sIPAddress = Request.ServerVariables("HTTP_X_FORWARDED_FOR") If String.IsNullOrEmpty(sIPAddress) Then sIPAddress = Request.ServerVariables("REMOTE_ADDR") End If Return sIPAddress End Function
EDIT
Found similar problem here:
Have deployed many 2008 32 bit standard web servers using the citrix netscaler isapi (the netscaler being a load balancer), in all cases the client IP address is logged in the standard IIS logs. On a new project I was asked to deploy 2008 R2, configured IIS 7.5 identically with how I configured IIS 7.0 in the past, this time however the client ip is returning the load balancer address in the logs. Here is the weird part, I installed "advanced logging" and it is showing the client IP address properly, so the isapi is doing its job. Have googled this one to death and could use some advice.
I also found ISAPI Filter module but cannot make it work: devcentral.f5.com/x_forwarded_for_log_filter_for_windows_servers
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HasanG over 12 yearsNo it is returning same address: 178.18.198.2
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Pleun over 12 yearsThis works fine for me, it seems more an infrastructure issue
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HasanG over 12 yearsAsked question at serverfault, hope the problem solves: serverfault.com/questions/270751/server-records-wrong-ips
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Ian Jowett about 9 yearsIts due to the IIS Proxy, I have same issue, unfortunately Pleun, the ip header is changed at the IIS Proxy / Proxy level.
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Kiquenet almost 7 yearskb.parallels.com/6735 redirect to kb.plesk.com/en/6735, and not found
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Kiquenet almost 7 yearsThe same is
Request.UserHostAddress.ToString();
andHttpContext.Current.Request.ServerVariables["REMOTE_ADDR"].ToString()
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Kiquenet almost 7 yearsUseful about Advanced Logging 1) iis.net/downloads/microsoft/advanced-logging 2) loadbalancer.org/blog/iis-and-x-forwarded-for-header 3) iis.net/learn/get-started/whats-new-in-iis-85/…