Hi guys I have been using lunix mint for 1 month, browsing internet quite a lot without any problem but sudenly I found that can't access those websites: www.acra.gov.sg and www.customs.gov.sg I tried to off all the internet application and access the website but it did not help. What can prevent from going this website, can it be some virus or what else? How to fix it.

I can browse the website using webproxy without any issues but I am still very curious what can't connect directly from linux mint machine.

I'm not sure I get your point. You are accessing the web via a webproxy? Have you tried accessing those sites without using proxies? If you're saying that you can only see them through proxies, I don't know what to say. Here on Slackware I was able to open them both.

Without proxy I can't open them at all

does it mean problem is not with linux? maybe I got some virus

Doubt you have a virus, what browser are you using ?
open a terminal and type:

nc -vv 160.96.1.173 80
*above looks like the letter 'w' as in 'whale'
*type instead 2 'v's as in vanished


Whats the response ?

nc -vv 160.96.1.173 80
Connection to 160.96.1.173 80 port [tcp/http] succeeded!

I use Mozilla and Crome google and both cant open the website

What country do you live in ?
Your Government might be blocking them ?
or
Your ISP is on behalf of that Govt.?

i can see Singapore customs just fine
even with "No-Script" and "Add block plus" running

I live in Singapore, using windows computer and same internet provider I can see the website fine also, using lunix mint XFCE I get message

The site could be temporarily unavailable or too busy. Try again in a few
moments.
If you are unable to load any pages, check your computer's network
connection.
If your computer or network is protected by a firewall or proxy, make sure
that Firefox is permitted to access the Web.

Have you tried clearing your browser cache? Where is the proxy situated and how are you enabling and disabling it?

yes did clear cache, I just used webproxy and didn't enable anything

I think I'd have checked nslookup or dig and then tried that ip in browser.

Try both www and without for the address to be sure.

Try both but nslookup IP dodnt work as well
http://160.96.1.173/ when try this ip it says Bad Request (Invalid Hostname)

http://160.96.178.46/ if nslookup without www the it says No web site is configured at this address.

~ $ dig www.acra.sg

; <<>> DiG 9.8.1-P1 <<>> www.acra.sg
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 26827
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;www.acra.sg. IN A

;; Query time: 257 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Sat Aug 11 10:55:03 2012
;; MSG SIZE rcvd: 29

dig www.acra.gov.sg

; <<>> DiG 9.8.1-P1 <<>> www.acra.gov.sg
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 26246
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;www.acra.gov.sg. IN A

;; ANSWER SECTION:
www.acra.gov.sg. 8867 IN A 160.96.1.173

;; Query time: 128 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Sat Aug 11 11:01:26 2012
;; MSG SIZE rcvd: 49

Sorry, I did say that wrong. I should have said dig or nslookup to the FQDN. (fully qualified domain name) then use the IP address returned (if returned)

So what does 160.96.1.173 do when you put it into a brower address line?

No it didn't, still cant open the website