accidentally I was changed the the settings of security in system management tools on PI to PI server
it was before as below picture :
then I enable all of the list and save it, once I did that I lost the communication of PI server. se the below picture:
when I tried to reset the setting back to same before it given me this message (unable to save security settings or change allow explicit login for piadmin on server "PISERVER" security settings error : connection to the server lost. edit piadmin error : too soon to attempt reconnection.)
any advice please ...