Outlook Cannot Connect To Proxy Server Error Code 10
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Outlook Is Unable To Connect To The Proxy Server Error Code 10 Exchange 2013
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There Is A Problem With The Proxy Server's Security Certificate Error Code 10 Exchange 2013
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» Exchange 2013 certificate error: There is a problem with the proxy server's security certificate. Let's take a look at an issue where users keep getting the following
Outlook Is Unable To Connect To The Proxy Server Error Code 8 Windows 7
pop up in the outlook client frequently. There is a problem with there is a problem with the proxy server's security certificate error code 80000000 the proxy server's security certificate. The name on the security certificate is invalid or does not match the name outlook is unable to connect to the proxy server error code 0 exchange 2013 of the target site "server.domain.local" Outlook is unable to connect to the proxy server. (Error Code 10) Possibility 1: => On the user's machine launch Outlook=> Click File => Go to Account https://support.microsoft.com/en-us/kb/923575 Settings. => Select the email account and then click Change. => Click the More Settings button. => Now click the Exchange Proxy Settings. => Copy the URL for "Only connect to the proxy servers that have this principle name in their certificate" & try to browse it. => You will get a certificate error, click on the top red x mark next to the http://msexchangeguru.com/2015/10/02/error-code10/ address bar. It will open a certificate. => Check the DNS names listed in the certificate & make a note of them. => Now go the Exchange Server, Launch Exchange Management Shell.' => Run the following command: Get-OutlookAnywhere => Look for the following options: ExternalHostname mail.domain.com InternalHostname mail.domain.local => Compare these two entries with the list of names we collected from the client machines certificate. => You will find that the internal host name is missing in the certificate. => To resolve this issue, we can run the following command to match the Internal Host name to the External host name as in the certificate SAN entry: Set-OutlookAnywhere -Identity "EXCH201301Rpc (Default Web Site)" -InternalHostname mail.domain.com -InternalClientsRequireSsl $true => Next run IIS reset or simply recycle the AutoDiscover AppPool in the IIS Manager. => This change will take effect soon after the user closes & reopens the outlook, however the default autodiscover refresh internal is 1 hour, so it's better to test after an hour or so. Possibility 2: Run the following script. Note that not all of this is relevant to the subject matter issue but you need
proxy server's security certificate. The name on the security certificate is invalid or does not match the name of the target site server.domain.com. Outlook is unable to connect http://markgossa.blogspot.com/2015/10/outlook-2013-there-is-problem-with-the-proxy-servers-security-certificate.html to the proxy server (Error Code 10) The name on the security certificate is invalid or does not match the name of the site The cause of these errors is that Outlook is connecting using Outlook Anywhere although it is able to contact Exchange, it is using a name that is not on the certificate. To resolve the issue, there are two options. Either you need to create proxy server a new certificate request and add the name to the certificate (see here for instructions) or you need to configure Exchange not to autoconfigure Outlook with this name and specify a different name that is on the certificate. This autoconfiguration is known as autodiscover. More on that in another post. In this post, we'll look at how to configure Exchange Outlook Anywhere so that this issue no longer occurs. the proxy server 1) Confirm current Outlook Anywhere hostnames We need to confirm that the Outlook Anywhere hostname includes the hostname in the error, in our case litex01.litwareinc.com. To do this run the below command: Get-OutlookAnywhere | fl ExternalHostname,InternalHostname 2) Create DNS records We need to choose a name that is included on the certificate that is used by the CAS servers and/or reverse proxies. In our case, we will use the same name, mail.litwareinc.com, in internal and external DNS as we are using split brain DNS. You can use different names as long as both are included on your certificate. Using a single name is simpler for troubleshooting and means that less names are required on the certificate which can reduce your costs in some cases. The internal A recordneeds to resolve to the internal IP of the CAS server or load balancer virtual IP if you are load balancing multiple CAS servers. The external A recordneeds to resolve to the public IP of the CAS server or load balancer virtual IP if you are load balancing multiple CAS servers. If you are using a reverse proxy then you need to configure the A record to resolve to the public IP of your reverse