Proxy Server Certificate Error Code 18
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Outlook Is Unable To Connect To The Proxy Server Error Code 8 Windows 7
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Outlook Is Unable To Connect To The Proxy Server Error Code 20
Hire for a Full Time Job Ways to Get Help Expand Search flag_security_channel_error Submit Close Search Login Join Today Products BackProducts Gigs Live Courses Vendor Services Groups Careers Store Headlines Website Testing flag_security_channel_error 0x80000000 Experts Exchange > Questions > Outlook is unable to connect to email.company.com (Error Code 18) Want to Advertise Here? Solved Outlook is unable to connect to email.company.com (Error Code 18) Posted https://support.microsoft.com/en-us/kb/923575 on 2012-12-13 Exchange Outlook 1 Verified Solution 7 Comments 5,341 Views Last Modified: 2012-12-26 Users are now receiving the following error message: There is a problem with the proxy server's security certificate. The security certificate is not from a trusted certifying authority. Outlook is unable to connect to the proxy server mail.company.com. (Error Code 18) After an unexpected shutdown of our domain controller, https://www.experts-exchange.com/questions/27967349/Outlook-is-unable-to-connect-to-email-company-com-Error-Code-18.html users are now getting the above error message in Outlook. Even when the user enters his/her correct credentials, they are prompted again. Some users do not have the problem, a simple logoff and log back in resolved the issue. What I've noticed is that for the users that are having the problem, no CA is installed. Confirmed by going into IE > certificates > Trusted Root Certification Authorities. Why wouldn't the CA be accepted by some users, and not others? I would think I could access OWA on that users machine and install the CA, but the 'install certificate' option isn't available. Any thoughts? 0 Question by:Michael-Thomas Facebook Twitter LinkedIn Google LVL 2 Best Solution byMichael-Thomas The Outlook prompt issue actually had nothing to do with the certificate. It turns out the users getting prompted were somehow getting directed to our Exchange 2003 server, which is still in the mix Go to Solution 7 Comments LVL 7 Overall: Level 7 Exchange 3 Outlook 2 Message Expert Comment by:tolinrome2012-12-13 Are the users who are having problems authenticated on the domain? I'm only saying this because th
a Question Ask for Help Receive Real-Time Help Create a Freelance Project Hire for a Full Time Job Ways to Get Help Ask a Question Ask for Help Receive Real-Time Help Create a Freelance Project Hire for https://www.experts-exchange.com/questions/28179277/Outlook-is-unable-to-connect-to-proxy-server-com-Error-Code-18.html a Full Time Job Ways to Get Help Expand Search Submit Close Search https://www.youtube.com/watch?v=r8tM_bj5fbA Login Join Today Products BackProducts Gigs Live Courses Vendor Services Groups Careers Store Headlines Website Testing Experts Exchange > Questions > Outlook is unable to connect to proxy server ****.****.com Error Code 18 Want to Advertise Here? Solved Outlook is unable to connect to proxy server ****.****.com Error Code 18 Posted proxy server on 2013-07-09 Outlook Windows Server 2008 Windows Server 2003 1 Verified Solution 6 Comments 1,474 Views Last Modified: 2013-07-28 Hi All, We have outlook 2007, and exchange 2007 running on Server 2003 R2. I have recently Transfered the FSMO roles, Upgraded the domain functional level ect to Server 2008R2 DC. This may be coinsidense but since doing it, my users have been getting an error the proxy server when they Open outlook in the morning, "There is a problem with the proxy server's security certificate. The security certificate is not from a certifying authority. Outlook is unable to connect to the proxy server ****.****.com. (Error Code 18)." If i change the settings in outlook by unticking "Connect to Exchange over HTTP" then the problem obviously goes away, yet OWA is still completely usable? Thanks 0 Question by:xObIA Facebook Twitter LinkedIn Google LVL 1 Best Solution byxObIA Has this Post been forgotten? Go to Solution 6 Comments LVL 6 Overall: Level 6 Windows Server 2008 2 Outlook 2 Windows Server 2003 1 Message Expert Comment by:vmdude2013-07-09 Hi, I take it you use a certificate authority signed SSL certificate on the Exchange 2007 CAS server? If so is it still valid or has it expired? 0 LVL 1 Overall: Level 1 Message Author Comment by:xObIA2013-07-10 I don't know what certificate is being used or what type it is. 0 LVL 6 Overall: Level 6 Windows Server 2008 2 Outlook 2 Windows Server 2003 1 Message Expert Comment by:vmdude2013-07-10 I think we need to know this information to help troubleshoot. Ca
is unable to connect to the proxy server Error Code 10 IT SUPPORT SubscribeSubscribedUnsubscribe99 Loading... Loading... Working... Add to Want to watch this again later? Sign in to add this video to a playlist. Sign in Share More Report Need to report the video? Sign in to report inappropriate content. Sign in Statistics 2,830 views 1 Like this video? Sign in to make your opinion count. Sign in 2 0 Don't like this video? Sign in to make your opinion count. Sign in 1 Loading... Loading... Loading... Rating is available when the video has been rented. This feature is not available right now. Please try again later. Published on Mar 22, 2016---------------------------Microsoft Outlook---------------------------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.Outlook is unable to connect to the proxy server. (Error Code 10)---------------------------OK --------------------------- Category People & Blogs License Standard YouTube License Show more Show less Loading... Advertisement Autoplay When autoplay is enabled, a suggested video will automatically play next. Up next How to fix certificate errors in Exchange 2010 2013 - Duration: 23:31. Robert McMillen 7,385 views 23:31 Outlook Certificate Error - Duration: 3:32. RazoRSharp Networks 6,612 views 3:32 Microsoft Outlook is unable to connect to the proxy server Error Code 8 - Duration: 2:50. IT SUPPORT 6,178 views 2:50 Outlook - Client-side Troubleshooting Tools - Duration: 25:45. Microsoft Partner Support 39,721 views 25:45 139 videos Play all Teh Lurd of Teh ReingsTeh Lurd Of Teh Reings Configure emails correctly to avoid security certificate errors - Duration: 2:37. Kyle Dearle 9,001 views 2:37 How to Fix "Can't Connect to Proxy Server" on Windows 10 - Duration: 11:18. Techddictive 46,416 views 11:18 10-Configuring Outlook 2016 and Outlook 2013 for Exchange Server 2016 - Duration: 18:43. ITCents