the lync is an confused app. I have allowed follow FQDN and port in my firewall because when lync start it does bypass at the proxy setting in the local machine so it forward initial connections by gateway that is my firewall. after the lync comes forward package by proxy. sipdirbl20b00.online.lync.com sippoolsn20a01.online.lync.com sipdirbl20b00.online.lync.com sippoolsn20a01.online.lync.com for each fqdn I have allowed follow ports 443 STUN/TCP 443 PSOM/TLS 3478 STUN/UDP 5223 UDP 50000-59999 RTP/UDP I have allowed follow strings at the my proxy. .microsoftonline.com. .outlook.com. .lync.com. I wonder when lync uses the proxy and when it bypass!! but all to work it's need allow that's string in proxy as well as port/fqdn in the firewall. thanks 2012/5/8 Amos Jeffries <squid3@xxxxxxxxxxxxx>: > On 09.05.2012 01:29, Usuário do Sistema wrote: >> >> Hi, I have done only follow strings in my allow file. >> >> >> .microsoftonline.com. >> .outlook.com. >> .lync.com. >> >> it's working! >> >> > > Which puts into doubt *why* that worked for you. Lync is not exactly an HTTP > client software. Do you have Squid setup to bypass of all security settings > for those domains? > >> >> 2012/5/8 a bv: >> >>> Hi, >>> >>> How can i give access to the some users to be able to use Microsoft >>> Lync through squid? >>> >>> >>> Regards > > > Appears to be an IM client. Any idea how it works over HTTP? > > Amos