Hi guys, My friend has a PC. He told me he has a problem when opening Iranian pages. The problem was that the browsers couldn't open them. Both of us live in Iran. I told him bring your PC in my office and I try to find out the issue. Our modems are the same and each one of us use TP-Link TD-8817 modem to connect to the Internet using ADSL service. He told me that the issue is to do with the OS so I tried his PC using my modem and my line. His PC didn't has any problem with my line in my office. And I said him the problem is not about the PC, call the ISP. Our ISP is the same and the line we both use is from telephone company. They told him the line hasn't any issue. Now the only point I can think of it is about the updating of modem's firmware. I think probably the issue only remains to the modem so updating it maybe is the answer. What do you guys think? Thanks in advance.