SL: strange network issue with browsing

[tripleacs]

Hi,

Ever since I upgraded to 10.6 (clean install from Leopard), Ive noticed a strange but irritating issue here, it happens with several sites but here is an example:

-> MBP: Safari and Firefox: I cannot browse to www.ultraedit.com
-> MBP: Parallels running XP: no problems going to www.ultraedit.com
-> ok.. my old XP laptop as a last resort: no problems at all.

So what could be happening here, and what could I do about it.

Tried rebooting my Macbook Pro 15" and AEBS and ADSL router. But no luck so far.

Anyone have ideas? Thanks.

 

[jmpage2]

Hi,

Ever since I upgraded to 10.6 (clean install from Leopard), Ive noticed a strange but irritating issue here, it happens with several sites but here is an example:

-> MBP: Safari and Firefox: I cannot browse to www.ultraedit.com
-> MBP: Parallels running XP: no problems going to www.ultraedit.com
-> ok.. my old XP laptop as a last resort: no problems at all.

So what could be happening here, and what could I do about it.

Tried rebooting my Macbook Pro 15" and AEBS and ADSL router. But no luck so far.

Anyone have ideas? Thanks.

I just tested on my machine (Safari 4 under SL 10.6.0) and it worked fine.

Try doing this from the terminal;

'dig www.ultraedit.com' and report the output here.

Once you find the IP address you can try browsing directly to the site by IP vs. by using its web server URL.

Here's the output from my machine;
; <<>> DiG 9.6.0-APPLE-P2 <<>> www.ultraedit.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 26764
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;www.ultraedit.com. IN A

;; ANSWER SECTION:
www.ultraedit.com. 86400 IN A 209.62.51.220

;; Query time: 166 msec
;; SERVER: 192.168.0.1#53(192.168.0.1)
;; WHEN: Fri Sep 4 18:21:46 2009
;; MSG SIZE rcvd: 51

The answer section shows the IP address of the site, 209.62.51.220.

If you don't get the same IP it's possible that your ISP is having issues with DNS resolution or that you have something in your SL configuration that is affecting DNS resolution.

 

[torpy]

I've had problems like this in SL too. Try running the following command in terminal (flushes your local DNS cache):

dscacheutil -flushcache

 

[tripleacs]

Hi. Thanks guys, but no luck so far..

Ive tried to flush the dns cache as you advised, and here is the output of dig as well..

Strange that it works immediately in parallels.. I'll try and do a packet trace as a last resort.


; <<>> DiG 9.6.0-APPLE-P2 <<>> www.ultraedit.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 33728
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;www.ultraedit.com. IN A

;; ANSWER SECTION:
www.ultraedit.com. 72465 IN A 209.62.51.220

;; Query time: 25 msec
;; SERVER: 202.27.158.40#53(202.27.158.40)
;; WHEN: Sat Sep 5 12:29:27 2009
;; MSG SIZE rcvd: 51

 

[jmpage2]

What happens if you try to go to this link?

http://209.62.51.220/

If that doesn't work then I think a packet capture is going to be necessary to help you sort this out.

Have you tried logging in as another user on your machine and see if that user can browse to it? It could be your preferences, ad-block settings, etc.

 

[tripleacs]

Hi, Thanks. I did a packet trace.. DNS is working. I see a TCP SYN going out to the IP address but no response coming back! This happens with both Firefox and Safari, but not within parallells!

Going directly to the IP address makes no difference. I have turned off the SL firewall as well.

Perhaps something to do with bonjour and the AEBS?