Enablingthe SMTP authentication in Plesk: Log in to your Plesk control panel. Go to Tools & Settings and select Mail server Settings. Select the Relay Options and choose Enable SMTP services. You can get connected to the Plesk server management service provider if you are struggling to fix the issue on your own.
Thefollowing topics provide a starting point for troubleshooting vCenter Server authentication problems. Search this documentation center and the VMware Knowledge Base system for additional pointers. What to read next. Unable to Log In Using Active Directory Domain Authentication

Eachservice that will use Kerberos authentication needs to have an SPN set for it so that clients can identify the service on the network. It is registered in Active Directory under either a computer account or a user account. Although the Kerberos protocol is the default, if the default fails, authentication process will be tried using NTLM.

Thisissue can be solved by activating the key option in the settings menu of your modded PGSharp Pokemon Go application. For this, open the installed Modded application, and then you will see a star at the top left corner of the screen. Click on it and then select the Settings option. Then you have to activate the PGSharp key.
OnAndroid players need to: Go to 'Settings,' 'Apps,' and check Pokemon Go. Open app information and select 'clear cache.'. On IOS players need to: Uninstall Pokemon Go and restart
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Totroubleshoot this issue please head to Settings > Connections > Wi-Fi > Tap the cog symbol to the right of your router > Forget > Back > Toggle Wi-Fi off and on again > Select your router from the list of available connections, and run through the connection steps.
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how do i fix unable to authenticate