When i plug my phone into itunes for the ios update, it downloads but then says it cant connect to the server. How do i get my update?

When i plug my phone into itunes for the ios update, it downloads but then says it cant connect to the server. How do i get my update?

Here are Apple Steps for Error 21:
This error typically occur when security software interferes with the restore and update process. FollowTroubleshooting security software issues to resolve this issue. In rare cases, these errors may be a hardware issue. If the errors persist on another computer, the device may need service.
My additional advice:
Also Error 21 can occur with DFU Mode Restore, try Recovery Mode Restore. Restart computer. Open iTunes on computer. Connect iPhone to computer. Hold both home and power buttons until iTunes recognizes iPhone in Recovery Mode. This usually takes about 20 seconds of holding both buttons. Click Restore button of iTunes.

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