Outlook Cannot Connect To Proxy Server Error Code 20
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Outlook Is Unable To Connect To The Proxy Server Error Code 80000000
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There Is A Problem With The Proxy Server's Security Certificate Error Code 10 Exchange 2013
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There Is A Problem With The Proxy Server's Security Certificate Exchange 2013
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Follow 43 Mentions12 Products Neal (Exclaimer) Sales & Marketing Manager GROUP SPONSORED BY EXCLAIMER https://community.spiceworks.com/topic/257450-outlook-is-unable-to-connect-to-the-proxy-server TECHNOLOGY IN THIS DISCUSSION Join the Community! Creating your account only takes http://markgossa.blogspot.com/2015/10/outlook-2013-there-is-problem-with-the-proxy-servers-security-certificate.html a few minutes. Join Now Details: This morning I rebooted our exchange server and had a issue where I removed the teaming on a pair of nics on our HP exchange server. The HP network config utility crashed and locked up my nic configurations and caused proxy server some down time... Eventually got that resolved and reconfigured the servers static IP again, etc. All is well, our desktop users outlook connects and everyone is happy. Problem is I found out every person logged into our 3 terminal servers is unable to open outlook. What happens: User launches outlook prompts for password user enters password user gets the proxy server error: "There is a problem with the proxy server's security certificate. The name on the security certificate is invalid or does not match the name of the target site mail.domain.com. Outlook is unable to connect to the proxy server (Error Code 0)" You can either repeat the process into a loop, work offline, or cancel. Work offline opens outlook and then says it cannot load any of the directories. it then closes outlook. How was this working for months and now there is a problem? The certificate: Our exchange server has a SAN cert where the common name is filter.domain.com. This is so we could use it with our sonicwall appliance and the thing is pretty finicky so we gave it the Common name. The altnernatives are: mail.domain.com
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 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 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. 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 proxy. 3) Configure new Outlook Anywhere hostnames To configure Autodiscover Outlook Anywhere with the internal and external hostnames, run the command below on a single lin