If you have installed the Free Avast 2015 antivirus and you have access problems to the UV employee portal (https://personal.uv.es), you should proceed as follows: -If it is a UV computer, uninstall the avast2015 and install the McAfee VirusScan institutional antivirus (http://www.uv.es/distrisoft/antivirus/cas/) or, -In avast 2015 such, access Options / Active protection / Web Shield / Customize / Unmark the Activate HTTPS analysis box