WCF service startup error This collection already contains an address with scheme http

Question

I built a web application containing a WCF service contract and a Silverlight control which makes calls to that WCF service  On my development and test servers it works great    When I deploy to our live server and run the application I get an exception of type System ServiceModel ServiceActivationException which states that the service can not be activated due to an exception during compilation   The exception is      This collection already contains an address with scheme http  There can be at most one address per scheme in this collection    I read that this exception may be thrown if the web site has more than one host header  which is true on our live server   Apparently WCF services hosted in IIS can have only one base address   How can I get around this issue

User · Answer

I came by the same error on an old 2010 Exchange Server. A service(Exchange mailbox replication service) was giving out the above error and the migration process could not be continued. Searching through the internet, i came by this link which stated the below:

The Exchange GRE fails to open when installed for the first time or if any changes are made to the IIS server. It fails with snap-in error and when you try to open the snap-in page, the following content is displayed:

This collection already contains an address with scheme http.  There can be at most one address per scheme in this collection. If your service is being hosted in IIS you can fix the problem by setting 'system.serviceModel/serviceHostingEnvironment/multipleSiteBindingsEnabled' to true or specifying 'system.serviceModel/serviceHostingEnvironment/baseAddressPrefixFilters'."

Cause: This error occurs because http port number 443 is already in use by another application and the IIS server is not configured to handle multiple binding to the same port.

Solution: Configure IIS server to handle multiple port bindings. Contact the vendor (Microsoft) to configure it.

Since these services were offered from an IIS Web Server, checking the Bindings on the Root Site fixed the problem. Someone had messed up the Site Bindings, defining rules that were overlapping themselves and messed up the services.

Fixing the correct Bindings resolved the problem, in my case, and i did not have to configure the Web.Config.

User · Answer

I had this problem  and the cause was rather silly   I was trying out Microsoft s demo regarding running a ServiceHost from w in a Command Line executable   I followed the instructions  including where it says to add the appropriate Service  and interface    But I got the above error   Turns out when I added the service class  VS automatically added the configuration to the app config   And the demo was trying to add that info too   Since it was already in the config  I removed the demo part  and it worked

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Summary   Code solution  Here  Configuration solutions  Here  With the help of Mike Chaliy  I found some solutions on how to do this through code   Because this issue is going to affect pretty much all projects we deploy to a live environment I held out for a purely configuration solution   I eventually found one which details how to do it in  net 3 0 and  net 3 5   Taken from the site  below is an example of how to alter your applications web config    lt system serviceModel gt       lt serviceHostingEnvironment gt           lt baseAddressPrefixFilters gt               lt add prefix  net tcp   payroll myorg com 8000   gt               lt add prefix  http   shipping myorg com 9000   gt           lt  baseAddressPrefixFilters gt       lt  serviceHostingEnvironment gt   lt  system serviceModel gt       In the above example    net tcp   payroll myorg com 8000 and   http   shipping myorg com 9000 are the   only base addresses  for their   respective schemes  which will be   allowed to be passed through  The   baseAddressPrefixFilter does not   support any wildcards        The baseAddresses supplied by IIS may   have addresses bound to other schemes   not present in baseAddressPrefixFilter   list  These addresses will not be   filtered out    Dns solution  untested   I think that if you created a new dns entry specific to your web application  added a new web site  and gave it a single host header matching the dns entry  you would mitigate this issue altogether  and would not have to write custom code or add prefixes to your web config file

User · Answer

In  Net 4  you can use the multipleSiteBindingsEnabled option    lt system serviceModel gt       lt serviceHostingEnvironment multipleSiteBindingsEnabled  true  gt       lt  serviceHostingEnvironment gt   lt  system serviceModel gt    Then  you won t have to specify each address   http   msdn microsoft com en-us library system servicemodel servicehostingenvironment multiplesitebindingsenabled aspx

User · Answer

In my case root cause of this issue was multiple http bindings defined at parent web site i e  InetMgr- Sites- Mysite- properties- EditBindings  I deleted one http binding which was not required and problem got resolved

User · Answer

And in my case it was simple  I used  Add WCF Service  wizard in Visual Studio  which automatically created corresponding sections in app config  Then I went on reading How to  Host a WCF Service in a Managed Application  The problem was  I didn t need to specify the url to run the web service   Replace   using  ServiceHost host   new ServiceHost typeof HelloWorldService   baseAddress     With   using  ServiceHost host   new ServiceHost typeof HelloWorldService     And the error is gone   Generic idea  if you provide base address as a param and specify it in config  you get this error  Most probably  that s not the only way to get the error  thou

User · Answer

Did you see this - http   kb discountasp net KB a799 error-accessing-wcf-service-this-collection-already aspx  You can resolve this error by changing the web config file  With ASP NET 4 0  add the following lines to your web config    lt system serviceModel gt         lt serviceHostingEnvironment multipleSiteBindingsEnabled  quot true quot    gt    lt  system serviceModel gt     With ASP NET 2 0 3 0 3 5  add the following lines to your web config    lt system serviceModel gt         lt serviceHostingEnvironment gt              lt baseAddressPrefixFilters gt                   lt add prefix  quot http   www YourHostedDomainName com quot   gt              lt  baseAddressPrefixFilters gt         lt  serviceHostingEnvironment gt    lt  system serviceModel gt

[.net] WCF service startup error "This collection already contains an address with scheme http"

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