secure internet access

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Filename: 259565963.doc 1

Controlling Secure Internet Accessusing ISA Server 2004

Microsoft Internet Security andAcceleration (ISA) Server 2004

IntroductionMicrosoft Internet Security and Acceleration (ISA Ser!er 2""# $ro!ides %ranular

control o!er &o' clients on your net'ors access t&e Internet. )it& t&e multi*

net'orin% functionality of ISA Ser!er+ you can a$$ly t&is control to clients on any

net'or '&ose %ate'ay to t&e Internet is t&e ISA Ser!er com$uter.

Multi-Networking,sin% ISA Ser!er+ you can connect many net'ors to an ISA Ser!er com$uter+ and

control access amon% t&e net'ors. -ou can t&erefore control t&e Internet access of

any net'or for '&ic& t&e ISA Ser!er com$uter ser!es as t&e %ate'ay to t&e Internet.

Access RulesAccess rules determine &o' clients on a source net'or access resources on a

destination net'or.

-ou can confi%ure access rules to a$$ly to all Internet rotocol (I traffic+ to a s$ecific

set of $rotocol definitions+ or to all I traffic e/ce$t selected $rotocols.

ISA Ser!er includes a list of $reconfi%ured+ 'ell*no'n $rotocol definitions+ includin%

t&e Internet $rotocols t&at are most 'idely used. -ou can also add or modify additional

$rotocols.

)&en a client re0uests an oect usin% a s$ecific $rotocol+ ISA Ser!er c&ecs t&e access

rules. A re0uest is $rocessed only if an access rule s$ecifically allo's t&e client to

communicate usin% t&e s$ecific $rotocol and also allo's access to t&e re0uested oect.

ontrollin% Internet access de$ends $rimarily on t&e desi%n and order of access rules.

4&e only ot&er factor is confi%urin% t&e )e ro/y $ro$erties to re0uire aut&entication

for Internet re0uests+ as descried inA$$endi/ : onfi%urin% 44 olicyin t&is

document.

Tip

ontrollin% Internet access &as only t'o factors:

rdered access rules

)e ro/y $ro$erties

4&e follo'in% tale summari7es all of t&e o$tions a!ailale in access rule desi%n. 4&e

tale is or%ani7ed accordin% to t&e location of t&e $ro$erty on t&e access rule $ro$erties


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$a%e. 4o see an access rule $ro$erty $a%e+ doule*clic any access rule (suc& as t&e

8efault rule in t&e Fire'all olicy details $ane.

Note

ule elements referred to in t&is tale are descried in ule lementsin t&is

document.

4aro$erty omments elated rule

elements

;eneral


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elements

rotocols All outound I

traffic

Selected$rotocols

(c&oose from

list

All outound

$rotocols

e/ce$t selected

(c&oose from

list

4&e access rule

can a$$ly to all

$rotocols+ to

s$ecific$rotocols+ or to

all $rotocols

e/ce$t for t&e

s$ecified ones.

4&is $a%e also

$ro!ides access

to t&e 44

confi%uration

$ro$erties+

t&rou%& t&e

Filtering

utton. For

more

information+

see A$$endi/

: onfi%urin%

44 olicyin

t&is document.

rotocols

From A$$lies to

traffic from

t&ese sources

4&e net'or

oects from

'&ic& t&e

re0uests 'ill

come.


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elements

4o /ce$tions 4&e rule 'ill

not a$$ly to

traffic sent to

t&ese net'oroects.


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Rule EleentsAn ISA Ser!er rule element is an oect t&at you use to refine ISA Ser!er rules. For

e/am$le+ a sunet rule element re$resents a sunet 'it&in a net'or. -ou can create a

rule t&at a$$lies only to a sunet+ or a rule t&at a$$lies to a '&ole net'or e/clusi!e of

t&e sunet.

Anot&er e/am$le of a rule element is a user set+ re$resentin% a %rou$ of users. y

creatin% a user set and usin% it in an ISA Ser!er rule+ you can create a rule t&at a$$lies

only to t&at set of users.

-ou can see t&e rule elements t&at are a!ailale to you y e/$andin% t&e ISA Ser!er

com$uter node+ clicin% Firew!ll "olic#+ and selectin% t&e Tool$o%ta in t&e tas

$ane. 4&ere are fi!e ty$es of rule elements:

"rotocols&4&is rule element contains $rotocols t&at you can use to limit t&e

a$$licaility of access rules. For e/am$le+ you can allo' or deny access on one or

more $rotocols+ rat&er t&an on all $rotocols.

'sers&In t&is rule element+ you can create a user set to '&ic& a rule 'ill e

e/$licitly a$$lied+ or '&ic& can e e/cluded from a rule.

Content t#pes&4&is rule element $ro!ides common content ty$es to '&ic& you

may 'ant to a$$ly a rule. -ou can also define ne' content ty$es.

Sc(edules&4&is rule element allo's you to desi%nate &ours of t&e 'ee durin%

'&ic& t&e rule a$$lies.

Network o$)ects&4&is rule element allo's you to create sets of com$uters or ,@s

to '&ic& a rule 'ill a$$ly+ or '&ic& 'ill e e/cluded from a rule. For more

information+ see Network o$)ects&

4&e rule elements you 'ill use in t&e Internet access solutions descried in t&is

document are:


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+e$ C(!iningAccess rules determine '&at access is allo'ed. )e c&ainin% determines &o' t&at

access is ac&ie!ed+ s$ecifically '&en t&ere are ot&er )e ro/y com$uters et'een t&e

ISA Ser!er com$uter and your cor$orate Internet %ate'ay. For information aout &o'

to confi%ure )e c&ainin%+ see A$$endi/ : onfi%urin% )e &ainin%in t&is document.

Scen!rios4&ere are many scenarios in '&ic& Internet access control is im$ortant:

onser!in% limited and'idt& strictly for cor$orate use. In t&is scenario+ you may

'ant to limit Internet access to s$ecific 'esites t&at &a!e usiness !alue.

onser!in% limited and'idt& or reducin% em$loyee time s$ent on t&e Internet less

strictly+ y locin% s$ecific sites.

locin% of certain content ty$es+ eit&er ecause t&ey are ina$$ro$riate to your

cor$orate en!ironment+ or ecause t&ey re0uire too muc& and'idt&.

Allo'in% different le!els of Internet access to different %rou$s of users.

locin% of s$ecific sites for le%al reasons+ suc& as file s&arin% sites.

ontrollin% Internet access in a situation '&ere em$loyees may fail to loc

com$uters+ to $re!ent unaut&ori7ed users from accessin% t&e Internet.

educin% use of t&e Internet durin% 'or &ours y limitin% t&e times durin% '&ic&

Internet access is allo'ed.

Solutions4&e solutions to all of t&e listed scenarios rely on t&e fle/iility of access rules+ '&ic&

are rules of ISA Ser!er 2""# t&at control resource access+ in t&is case+ Internet access.In creatin% access rules+ you 'ill use rule elements. For more information+ see access

rulesand rule elements.

Network Topolog#4o allo' Internet access in an internal net'or scenario+ you need+ at a minimum:

A connection to t&e Internet. In a laoratory en!ironment+ t&is can e simulated y

a )e ser!er connected to t&e e/ternal net'or ada$ter of t&e ISA Ser!er

com$uter. o'e!er+ t&is could limit your aility to test t&e access limitations t&at

you create.

A com$uter to ser!e as t&e ISA Ser!er com$uter. 4&e ISA Ser!er com$uter must&a!e at least t'o net'or ada$ters. ne ada$ter 'ill e connected to t&e /ternal

net'or (re$resentin% t&e Internet and one ada$ter 'ill e connected to t&e

Internal net'or. If your solution in!ol!es additional net'ors+ suc& as a second

internal net'or+ eac& additional net'or re0uires its o'n net'or ada$ter on t&e

ISA Ser!er com$uter. 4&e confi%uration of t&e net'ors (suc& as numer of

com$uters+ users+ and sunets 'ill determine '&ic& of t&e solution o$tions you can

a$$ly to your scenario.


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A com$uter on a net'or e&ind t&e ISA Ser!er com$uter+ for '&ic& t&e ISA Ser!er

com$uter is t&e default %ate'ay.

Controlling Internet Access , +!lk-t(roug(

4&is 'al*t&rou%& %uides you t&rou%& t&e ste$s necessary to control Internet access

t&rou%& ISA Ser!er.

Controlling Secure Internet Access +!lk-t(roug( "rocedure . /!ck 'p #ourCurrent Conigur!tion

)e recommend t&at you ac u$ your confi%uration efore main% any c&an%es. If t&e

c&an%es you mae result in e&a!ior t&at you did not e/$ect+ you can re!ert to t&e

$re!ious+ acu$ confi%uration. Follo' t&is $rocedure to ac u$ t&e confi%uration of

your ISA Ser!er com$uter.

1. i%&t*clic t&e name of t&e ISA Ser!er com$uter+ and clic /!ck 'p.

2. In /!ckup Conigur!tion+ $ro!ide t&e location and name of t&e file to '&ic& you

'ant to sa!e t&e confi%uration. -ou may 'ant to include t&e date of t&e e/$ort in

t&e file name to mae it easier to identity+ suc& as E%port/!ckup21une2004.

3. lic /!ckup. If you are e/$ortin% confidential information suc& as user $ass'ords+

you 'ill e $rom$ted to $ro!ide a $ass'ord. 4&is $ass'ord 'ill e needed to restore

t&e confi%uration from t&e e/$orted file.

#. )&en t&e acu$ o$eration &as com$leted+ clic *.


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Controlling Secure Internet Access +!lk-t(roug( "rocedure 5. Conigure ISAServer Solutions

ac& solution uses one or more of t&e follo'in% $rocedures on t&e ISA Ser!er

com$uter:

reation of rule elements. 4&is is descried in A$$endi/ A: reatin% ule lements

in t&is document.

8esi%n and creation of access rules. 4&e $ro$erties of eac& rule are descried in t&is

$rocedure. A 'al*t&rou%& for t&e


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reate a ,@ set containin% t&e 'or*related sites t&at Staff are allo'ed to access

durin% 'or &ours.

Step 5. Cre!te ! sc(edule

reate a sc&edule t&at re$resents t&e 'or &ours for t&e Staff users. 4&ere is a

)or ours sc&edule t&at is $ro!ided 'it& ISA Ser!er+ '&ic& may meet your needs.

Step 4. Cre!te !n !llow !ccess rule or !ll users !t !ll ties

reate an access rule allo'in% unrestricted access to t&e Internet for all users on

t&e Internal net'or. Follo' t&e $rocedure in A$$endi/ : ,sin% t&e


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Step 7. Cre!te ! den# !ccess rule or St! on t(e Intern!l network

reate an access rule for Staff+ denyin% t&e Staff user set access to t&e Internet

e/ce$t for t&e ,@ set of allo'ed sites+ durin% t&e times indicated in t&e )or ours

sc&edule. Follo' t&e $rocedure in A$$endi/ : ,sin% t&e


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T!$ "ropert# Setting

ontent 4y$es A$$lies to:

All content ty$es

Selected content ty$es

All content ty$es

Step 8. Consider rule order

Al'ays consider rule order '&en creatin% access rules. In t&is solution+ t&e rule

denyin% access to t&e Staff user set durin% 'or &ours must a$$ear efore t&e rule

allo'in% access to all users at all times. If it a$$ears later in t&e order+ '&en a

re0uest arri!es from a Staff user+ ISA Ser!er 'ill read t&e allo' rule first and allo'

access to t&e entire Internet durin% 'or &ours.

Access controlled y net'or entityIn t&is scenario+ you allo' all of your users on t&e Internal net'or to access t&e

Internet. o'e!er+ you 'ant t&em to access only usiness*related sites from t&eir officecom$uters. 4&ere 'ill e se!eral com$uters a!ailale in t&e em$loyee rea room+

'&ere users can access all ot&er sites.

4&ere are at least t&ree $ossile a$$roac&es to t&is solution:

reate an allo' rule+ allo'in% access to t&e entire Internet from t&e rea room

com$uters. reate a deny rule+ denyin% access from t&e Internal net'or to t&e

Internet e/ce$t for t&e ,@ set of allo'ed sites. rder t&e allo' rule efore t&e

deny rule.

reate t'o s$ecific allo' rules+ one for t&e rea room set of com$uters+ allo'in%

access to t&e entire Internet+ and one for t&e Internal net'or+ allo'in% access only

to usiness*related sites.

reate an allo' rule for all of t&e com$uters on t&e Internal net'or. reate a deny

rule for a set of com$uters includin% all of t&e com$uters on t&e Internal net'or

e/ce$t for t&ose in t&e rea room+ denyin% access to t&e Internet e/ce$t for

usiness*related sites. lace t&e deny rule efore t&e allo' rule.

Cop!nion scen!rio

-ou may &a!e t&e o$$osite situation: an Internal net'or from '&ic& access to

t&e entire Internet is allo'ed+ and com$uters in a loy t&at s&ould not &a!e

any access to t&e Internet. In t&is case+ you 'ould create a com$uter set

includin% t&e loy com$uters+ and an allo' rule allo'in% access from t&e

Internal net'or to t&e /ternal net'or+ ut listin% t&e @oy om$uters

com$uter set as an e/ce$tion in t&e Frota.

4&e solution $resented is t&e first one+ ecause it is easier to create a small com$uter

set includin% t&e rea room com$uters+ t&an to create a set of all of t&e ot&er

com$uters on t&e Internal net'or.


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Follo' t&ese ste$s to create t&e solution. 4&e $rocedures for creatin% t&e net'or entity

and ,@ set rule elements are descried in A$$endi/ A: reatin% ule lementsin t&is

document.

Step . Cre!te t(e network entit#

4&e net'or entity you create 'ill e a set of I addresses t&at is a suset of a

net'or defined in ISA Ser!er. In t&is e/am$le+ you 'ant to create a com$uter sett&at contains t&e rea room com$uters+ '&ic& is a set of com$uters in t&e Internal

net'or.

Step 2. Cre!te ! 'R6 Set

reate a ,@ set containin% t&e 'or*related sites t&at can e accessed from all

com$uters.

Step 5. Cre!te ! den# !ccess rule or t(e Intern!l network

reate an access rule for Staff+ denyin% access from t&e Internal net'or to t&e

Internet e/ce$t for t&e ,@ set of allo'ed sites. Follo' t&e $rocedure in A$$endi/ :

,sin% t&e


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4o /ce$tions 4&e ,@ set of acce$tale

'or*related sites

,sers A$$lies to re0uests from

t&e follo'in% user sets

All users

,sers /ce$tions


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4o /ce$tions


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Access controlled y content ty$eIn t&is scenario+ you &a!e to $reser!e limited and'idt& for usiness use+ and t&erefore

'ant to $re!ent access to !ideo and audio files+ '&ic& use a lar%e amount of

and'idt&. 4&ere are t'o $ossile solutions for t&is scenario.

reate an allo' rule+ allo'in% all users access to t&e Internet 'it&out e/ce$tions+and t&en create a deny rule+ denyin% all users access to t&e s$ecific content ty$es.

Mae sure t&at t&e deny rule $recedes t&e allo' rule in t&e rule order.

reate an allo' rule+ allo'in% all users access to t&e Internet+ ut only for s$ecific

content ty$es.

4&e second a$$roac& is descried+ ecause it re0uires only one access rule. Follo' t&e

$rocedure in A$$endi/ : ,sin% t&e


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From /ce$tions


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s&ould e $ro!ided+ and t&at connection status s&ould not e $ro!ided. -ou can

edit t&ese conditions+ and add additional conditions to limit t&e information retrie!ed

durin% t&e 0uery.

#. For e/am$le+ select 6og Tie. From t&e Conditiondro$*do'n menu+ select 6!st

24


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as 44S.

,@ 0uals A ,@ ro!ides a lo%

of attem$ts to

access a

s$ecific ,@.

,@ ontains A ,@ ro!ides a lo%

of attem$ts to

access ,@s

containin% a

s$ecific strin%+

suc& as

gambling.

D. After you &a!e created an e/$ression+ clic Add to listto add it to t&e 0uery list+

and t&en clic St!rt =uer#to start t&e 0uery. -ou must clic St!rt =uer#to sa!e

your c&an%es.

Controlling Secure Internet Access +!lk-t(roug( "rocedure 7. Cre!te !nInternet Access Report

-ou can create re$orts t&at summari7e Internet access t&rou%& t&e ISA Ser!er

com$uter. -ou can create eit&er a re$ort t&at runs once+ or a recurrin% re$ort t&at runs

at a fre0uency t&at you s$ecify.

Follow t(is gener!l procedure to cre!te ! report t(!t runs once&

9. In t&e Microsoft ISA Ser!er Mana%ement console tree+ select Monitoring&

1". In t&e Monitorin% details $ane+ select t&e Reportsta.

11.n t&e T!sksta+ select ener!te ! new reportto start t&e


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1C.e!ie' t&e information on t&e summary $a%e+ and t&en clic Finis(. 4&e re$ort 'ill

e dis$layed in t&e Monitorin% details $ane on t&e Reportsta.

Follow t(is gener!l procedure to cre!te ! recurring report&

1. In t&e Microsoft ISA Ser!er Mana%ement console tree+ select Monitoring&2. In t&e Monitorin% details $ane+ select t&e Reportsta.

3. n t&e T!sksta+ select Cre!te !nd Conigure Report 1o$sto o$en t&e Report

1o$s "ropertiesdialo% o/.

#. lic Addto start t&e


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5. At t&e to$ of t&e list of elements+ clic New. If t&ere are se!eral c&oices of rule

elements+ as in t&e case of net'or oects+ a dro$*do'n list 'ill a$$ear+ and you

can select t&e element t&at you 'ant to create.

6. ro!ide t&e information re0uired y t&e 'i7ard or a dialo% o/. )&en you &a!e

com$leted t&e 'i7ard or cliced *in t&e dialo% o/+ your ne' rule element 'ill e

created.C. lic Appl#in t&e details $ane to a$$ly c&an%es. If you $refer+ you can clic Appl#

after you &a!e created your access rules+ t&at is+ after you &a!e made all of your

c&an%es+ rat&er t&an after eac& c&an%e. It 'ill tae a fe' moments for t&e c&an%es

to e a$$lied.

Appendi% /. 'sing t(e New Access Rule+i>!rd

T(is procedure descri$es t(e New Access Rule +i>!rd in gener!l ters&

1. In t&e Microsoft ISA Ser!er Mana%ement console tree+ select Firew!ll "olic#.

2. In t&e tas $ane+ on t&e T!sksta+ select Cre!te NewAccess Ruleto start t&e


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1". In t&e Fire'all olicy details $ane+ clic Appl# to a$$ly t&e ne' access rule. It may

tae a fe' moments for t&e rule to e a$$lied. rder your access rules to matc&

your Internet access $olicy. If you c&an%e t&e order+ you 'ill need to clic Appl#to

a$$ly t&e c&an%es.

Appendi% C. Coniguring


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matc& t&e rule+ e!en if it is not re0uired in t&e )e ro/y $ro$erties. o'e!er+ a rule

t&at a$$lies to All ,sers 'ill not re0uire aut&entication unless you follo' t&is $rocedure.

1. In t&e Microsoft ISA Ser!er Mana%ement console tree+ e/$and t&e Conigur!tion

node and select Networks.

2. 8oule*clic t&e net'or '&ose )e access $ro$erties you 'ant to confi%ure+ to

o$en its $ro$erties dialo% o/. 4y$ically+ t&is 'ould e t&e Internal net'or. Selectt&e +e$ "ro%#ta.

3. Select En!$le +e$ "ro%# clients(t&is is t&e default settin% for t&e Internal

net'or.

#. lic Aut(entic!tionto o$en t&e Aut(entic!tiondialo% o/. -ou can select an

aut&entication ty$e.

5. Select Re9uire !ll users to !ut(entic!te.

4o select a default domain for aut&entication+ clic Select 3o!in. 4&is o$tion

is a!ailale only '&en asic+ 8i%est+ or A8I,S aut&entication is used.

4o select A8I,S ser!ers for aut&entication+ clic RA3I'S Servers.6. lic *to close t&e Aut(entic!tiondialo% o/+ and t&en clic *to close t&e

net'or $ro$erties dialo% o/.


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5. n t&e +e$ C(!ining Rule 3estin!tion$a%e+ clic Addto o$en t&e Add

Network Entitiesdialo% o/. Select Networks+ clic E%tern!l+ clic Add+ and

t&en clic Close. 4&is adds t&e /ternal net'or (t&e Internet as t&e destination+

ecause you 'ant to route Internet re0uests. n t&e +e$ C(!ining Rule

3estin!tion$a%e+ clic Ne%t.

6. n t&e Re9uest Action$a%e+ select &o' t&e re0uest 'ill e $rocessed: Retrieve re9uests directl# ro t(e speciied destin!tion&4&is o$tion does

not use )e c&ainin%.

Redirect re9uests to ! speciied upstre! server&If you select t&is o$tion+

t&e ne/t $a%e of t&e 'i7ard 'ill re0uest t&e u$stream ser!er information on t&e

"ri!r# Routing$a%e. 4o continue+ see Ste$ D.

Note

3eleg!tion o /!sic !ut(entic!tion

If you select Redirect re9uests to ! speciied upstre! server+ you may

also select Allow deleg!tion o $!sic !ut(entic!tion credenti!ls. ISA Ser!er

can &andle user aut&entication '&en t&e re0uest arri!es+ and t&en $ass t&e

aut&entication information to t&e )e ser!er so t&at t&e user does not &a!e to

su$$ly credentials a%ain.

Redirect re9uests to !


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9. If you selected Redirect re9uests to ! speciied upstre! serverin Ste$ 6+ you

ne/t see t&e /!ckup Action$a%e+ on '&ic& you can select acu$ routin% o$tions:

Ignore re9uests&

Retrieve re9uests directl# ro t(e speciied destin!tion&4&is o$tion does

not use )e c&ainin%.

Route re9uests to !n upstre! server&4&is 'ill enale you to select a

acu$ route (on t&e ne/t $a%e of t&e 'i7ard.

4&e /!ckup Action$a%e also allo's you to use a dial*u$ entry as t&e acu$

route for t&e re0uest+ y selectin% 'se !uto!tic di!l-up. efore you can use

a dial*u$ entry+ you must s$ecify an automatic dial*u$ connection+ as descried

in A$$endi/ F: S$ecifyin% an Automatic 8ial*u$ onnectionin t&is document.

lic Ne%t.

1". If you selected Route re9uests to !n upstre! serverin Ste$ 9+ you ne/t see

t&e /!ckup Routing$a%e+ on '&ic& you can select t&e acu$ route to '&ic&

re0uests 'ill e routed:

ro!ide t&e Server+ "ort+ and SS6 "ort information. -ou can also clic

/rowse+ to ro'se to t&e ser!er. 4&e default $ort numers $ro!ided are t&ose

t&at an u$stream ISA Ser!er com$uter 'ould listen on. -our u$stream ser!er

may listen on different $orts.

If s$ecific credentials are needed to access t&e ser!er+ select 'se t(is !ccount

and clic Set Accountto o$en t&e Set Accountdialo% o/.

In t&e Set Accountdialo% o/+ $ro!ide credentials t&at 'ill e acce$ted y t&e

ser!er+ and clic *.

In Aut(entic!tion+ select an aut&entication met&od.

lic Ne%t&

11.n t&e summary $a%e+ re!ie' t&e information+ and t&en clic Finis(.

Appendi% F. Speci#ing !n Auto!tic 3i!l-up Connection

-ou can confi%ure ISA Ser!er to dial automatically to estalis& a connection 'it& one

net'or. For e/am$le+ if you &a!e a dial*u$ connection to t&e Internet+ you can

confi%ure ISA Ser!er to dial automatically to t&e /ternal net'or. If you &a!e a &i%&*

s$eed Internet connection+ t&e dial*u$ connection can ser!e as your acu$ route to

t&e Internet+ as descried in A$$endi/ : onfi%urin% )e &ainin%in t&is document.

1. In t&e Microsoft ISA Ser!er Mana%ement console tree+ e/$and t&e Conigur!tion

node and select ener!l.

2. In t&e details $ane+ select Speci# 3i!l-up "reerences.

3. Select Allow !uto!tic di!ling to t(is network+ and select t&e net'or to '&ic&

you 'ill set u$ an automatic dial*u$ connection. In t&e case of usin% a dial*u$

connection for Internet access+ s$ecify t&e /ternal net'or.


26/26


#. If t&e dial*u$ connection is t&e $rimary 'ay you connect to t&e Internet+ select

Conigure t(is di!l-up connection !s t(e de!ult g!tew!#.

5. ,nder 3i!l-up connection+ in 'se t(e ollowing di!l-up connection+ $ro!ide

t&e name of t&e dial*u$ connection+ or locate it y clicin% Select.

6. If t&e dial*u$ connection is associated 'it& a s$ecific user account+ $ro!ide t&e user

name and $ass'ord under 3i!l-up !ccount y clicin% Set Account.

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