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Error numberError messageAdditional info and instruction
8021Unable to communicate with the testing server. Please contact your administrator. 

Contact your local system or network administrator. The network connection was either not found or the connection was lost during authentication. 

TestNav usually displays this error due to network connectivity problems. 

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8022Unable to communicate with the testing server. Please contact your administrator. 

Contact your local system or network administrator. The testing server URL that was requested was not found (404) or there was an internal server error (500) during authentication.

TestNav usually displays this error due to network connectivity problems. 

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8023Unable to communicate with the testing server. Please contact your administrator. 

Contact your local system or network administrator. There was a parser error (bad data was sent from the application to the engine or from the engine to the server) during authentication. The user's login information was sent to the server, but either it or the response was empty, malformed, or corrupted.  

TestNav usually displays this error due to network connectivity problems. 

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8024Unable to communicate with the testing server. Please contact your administrator.

Contact your local system or network administrator. The transmission timed out during authentication.

TestNav usually displays this error due to network connectivity problems. 

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8025There has been a problem loading this item. Please contact your administrator.

Contact your local system or network administrator; the transmission aborted during authentication.

TestNav usually displays this error due to network connectivity problems. 

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8026Unable to connect to the proctor caching computer. Please contact your administrator. 

TestNav usually displays this error due to network connectivity problems.

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8027iOS:
The testing server can not be reached. Please verify your internet connection and then choose Retry, or close the app and try again later. ChromeOS: 
The application start page server can not be reached. Please verify your internet connection and then choose retry, or close the app and try again later.

Contact your local system or network administrator; a . A network connection could not be established. 

TestNav usually displays this error due to network connectivity problems. 

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8028The java applet is unable to load.  This can occur when Oracle disables an existing version of Java because a new version has been released that contains critical fixes. Please upgrade to the latest version of Java.Upgrade Java on your machine.
8029 The installed app is out of date and needs to be updated in order to use TestNav on this device.Download and install the latest version of the app.
8030 A required file has been changed, and the test cannot start. Please contact your administrator.Contact your local system or network administrator; a . A required file has been changed.

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