Internet connection problem with 9.10

[Geoffrey Combes]

Last night I upgraded Ubuntu from 9.08 to 9.10. After re-establishing my 
Telstra MobileWireless connection (not straightforward  as I discovered 
with 9.08) I opened and connected Firefox, Epiphany and Evolution in the 
usual way successfully. However after opening once subsequent openings 
were unable to recognise sites. Firefox would not open Ubuntu start, 
Epiphany would not recognise "host" and Evolution reported an error in 
connection. Re-starting 9.10 allowed one successful attempt on all 
three  then failed on all three on subsequent attempts.
I am using NoScript with Firefox and I believe that I have it under 
control. I am not using NoScript with Epiphany.
I think I need some help from members.
Geoffrey Combes