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TCP error code 10061: No connection could be made because the target machine actively refused it

Hello Experts,
Currently I am trying to run a website from localhost (it is c# application rnning under Visual Studio 2008).  Till last week I did not have any issues.  All of a sudden I started getting this error as below.  Do you know what is causing it?  Many thanks in advance.

Could not connect to http://ServerName/xxxx/services/UserAuthService/. TCP error code 10061: No connection could be made because the target machine actively refused it xx.xx.xx.xxx:80.
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RadhaKrishnaKiJaya
Asked:
RadhaKrishnaKiJaya
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1 Solution
 
Element1910Commented:
Are you trying to run a webservice from the web page? Verify that there is no anti-virus or firewall blocking the connection or process on the port running your web service. Also try to run netstat -anb from the command prompt to see that the web service/site is running under the expected port.
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OrcbighterCommented:
If your application was working last week, and now its not.
1. Have you changed anything on either machine since last week?
2. Have you confirmed that your firewall is not blocking the call?

If this is not the cause of your problem, then further investigation is warranted.
1. Ping the IP address to confirm it is reachable
2. Confirm that another application is not using that port
3. Confirm that your server is actually listening on that port
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RadhaKrishnaKiJayaAuthor Commented:
Hi Element1910 and Orcbighter, Thank you very much for your post here.  I really appricate it.  The real problem was with the web.config file, where we use auto generated machine key as password.  I changed the password to actual one.  After that machine generated it again and worked fine.  Thank you again for your help.
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RadhaKrishnaKiJayaAuthor Commented:
Reason is already stated.
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