Hi, this topic came up here quite a while ago however without really finding a solution. We configured a squid reverse proxy for Exchange 2010 (owa, active-sync etc.). All is working quite well with a small exception: The first load of owa takes 2-3 minutes. According to firebug the time is spend in uglobal.js (> 2m). Once all is loaded things seem to work just fine. This happens with every browser I tested (IE, Firefox, Safari, Chrome) at least once during the initial load of the page. If you kill the browser and restart OWA things are ok. This does NOT happen if I address the Exchange server OWA in question directly, at least I was not able to reproduce it. Any idea where/how to look? cache.log does not say anything regarding this. Kind regards, JP -- Seceidos GmbH&Co. KG | Tel: +49 (6151) 66843-43 Pfarrer-Staiger-Str. 39 | Fax: +49 (6151) 66843-52 55299 Nackenheim | Mobil: http://www.seceidos.de/ | Skype: jpkmobil E-Mail: Jan-Peter.Koopmann@xxxxxxxxxxx HRA 40961, Amtsgericht Mainz persönlich haftende Gesellschafterin: Seceidos Verwaltungs GmbH, Nackenheim HRB 42292, Amtsgericht Mainz Geschäftsführer: Jan-Peter Koopmann