ContributionsMost RecentMost LikesSolutionsRe: GoTo Opener encountered an error after initialization: The server deliveredthe unexpected content Finally I solved the issue by adding server certificate. After comparing with one system working, two certificates were missing. Since it was late Friday and haven't had time to verify which one is must, so I added both: VeriSign Universal Root Certification Authority DigiCert SHA2 Secure Server CA Just for my notes, could you verify which one exactly was missing (is used by your web services)? Rafal Re: GoTo Opener encountered an error after initialization: The server deliveredthe unexpected content Hi Still have that problem. This is standard computer, with standard hardware, any specific parts are connected to the system via network card (different that one used for internet connection). We have similar systems installed on many sites and it's the only one where we have the issue. I know that the 1st answer is firewall but we were open firewall and it still doesn't work. From Logs it looks like the problem is with downloading server certificate: 17:18:21 1230 loading https://builds.getgocdn.com:443/builds/g2ax/1599/g2ax_customer_combined_dll_core_win32_x86.exe 17:18:21 1230 configuring request 17:18:21 1230 sending request 17:18:41 13F0 HttpSendRequestEx async error 12057 17:18:41 1230 error checking server certificate revocation;cnt=1 17:18:42 13F0 HttpSendRequestEx async error 12057 17:18:42 1230 error checking server certificate revocation;cnt=2 17:18:43 1398 HttpSendRequestEx async error 12057 17:18:43 1230 error checking server certificate revocation;cnt=3 17:18:44 13F0 HttpSendRequestEx async error 12057 17:18:44 1230 error checking server certificate revocation;cnt=4 17:19:20 1398 HttpSendRequestEx async error 12057 17:19:20 1230 error checking server certificate revocation;cnt=5 17:19:21 13C8 HttpSendRequestEx async error 12057 17:19:21 1230 error checking server certificate revocation;cnt=6 17:19:26 1230 I: downloaded 0 bytes in 64958 milliseconds (0.0 KiB/s) 17:19:26 1230 I: endpointDownloadMetrics: bytesDownloaded=0&cscErrorCount=6&displayedAuthUi=false&displayedUi=true&hostName=builds.getgocdn.com&requestUrl=https%3a%2f%2fbuilds.getgocdn.com%3a443%2fbuilds%2fg2ax%2f1599%2fg2ax_customer_combined_dll_core_win32_x86.exe&resolvedHostAddr=78.108.120.124&result=ECOsInetError.eSEC_CERT_REV_FAILED&timeBlockedInUi=4492&timeToConnect=0&timeToDownload=0&totalTime=64958 17:19:26 1230 E: [downloadEndpoint] completed: 14057 (ECOsInetError::eSEC_CERT_REV_FAILED), The API HttpSendRequestEx failed with code 12057. Error returned at , taskdownload.cpp:218 Error occurred at , downloaderapp.cpp:1844 Error occurred at , downloaderapp.cpp:1791 17:19:26 1230 I: [completeInstall] started 17:19:26 1230 I: [leaveSingleInstance] started 17:19:26 1230 I: [startSendTelemetry] started 17:19:26 1230 I: [notifyUserIfFatalError] started 17:19:26 1230 E: flow error (not displayed): (14057) "ECOsInetError::eSEC_CERT_REV_FAILED" The API HttpSendRequestEx failed with code 12057. Error returned at , taskdownload.cpp:218 Error occurred at , downloaderapp.cpp:1844 Error occurred at , downloaderapp.cpp:1791 17:19:26 1230 E: displaying error: GoTo Opener encountered an error: The download server builds.getgocdn.com is untrusted. Failed to download GoToAssist from our servers. I really don't know how to solve the issue. If you give me any advise it would be appreciated. Rafal Re: GoTo Opener encountered an error after initialization: The server deliveredthe unexpected content What operating system is being affected? Windows 7 Embedded Which browser versions were tested? Firefox Portable and Internet Explorer If locally connected to the network, have you tested safemode for anything unseen that may be blocking the connection? No Re: GoTo Opener encountered an error after initialization: The server deliveredthe unexpected content Yes, I started it on my laptop connected to the same router and GoTo Opener run with no issues. There is no any firewall or antyvirus running on a computer which has the problem. Also I'm logged in as an Administrator. GoTo Opener encountered an error after initialization: The server deliveredthe unexpected content Hi I cannot start remote session with GoTo Opener. I've gotan error after initialization: "The server delivered the unexpected content-type application/x-msdownload. Failed to download GoToAssist from our servers." I have already tried to run session withGoToAssist Attended App and it works with no issues. Unfortunately it's not a solution for me since the link to Fastsupport site is in our application and it's not easy to modify our software. Solved