The ERR_SPDY_PROTOCOL_ERROR on the browser when accessing the operator console is due to few factors. Check with your hosting provider to see if Google PageSeed is enabled (mod_pagespeed). Try disabling the mod_pagespeed module and see if it improves the situation.
According to Google about Google PageSpeed:
For more information about the browser error ERR_SPDY_PROTOCOL_ERROR and the methods to correct the error without closing the browser, please visit the this helpful blog post.
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