Upgrade to 11 Network ACLs

Hi,
I'm upgrading from 10g to 11g. According to documentation ( Upgrade Guide B28300-03 )the following script should be executed befor upgrade :
DECLARE
acl_path VARCHAR2(4000);
BEGIN
SELECT acl INTO acl_path FROM dba_network_acls
WHERE host = 'host_name' AND lower_port IS NULL AND upper_port IS NULL;
IF DBMS_NETWORK_ACL_ADMIN.CHECK_PRIVILEGE(acl_path,
'user_name','connect') IS NULL THEN DBMS_NETWORK_ACL_ADMIN.ADD_PRIVILEGE(acl_path,
'user_name', TRUE, 'connect');
END IF;
EXCEPTION
WHEN no_data_found THEN
DBMS_NETWORK_ACL_ADMIN.CREATE_ACL('ACL_name.xml',
'ACL description', 'user_name', TRUE, 'connect');
DBMS_NETWORK_ACL_ADMIN.ASSIGN_ACL('ACL_name.xml','host_name');
END;
COMMIT;What should be then 'user_name', 'connect' ?
Thank you.

The user name is the user that requires the access as is demonstrated on my website:
When you look at this code:
BEGIN
dbms_network_acl_admin.create_acl(acl => 'mlib-org-permissions.xml',
description => 'Network permissions for *.morganslibrary.org',
principal => 'UWCLASS', is_grant => TRUE, privilege => 'connect');
END;
/do you see SYS?

Similar Messages

Network ACLs topics after upgrade to 11g.

Hi Group
On my pre script upgrade from 10.2.0.4 to 11.1.0.7, a message appear on the final part of the log:
WARNING: --> Database contains schemas with objects dependent on network
packages.
.... Refer to the 11g Upgrade Guide for instructions to configure Network ACLs.
.... USER USR_COMP has dependent objects.
.... USER USR_DEV has dependent objects.
Really I don't know what to do on this issue.
I've read the instructions and I have executed the following but I'm not sure it be right procedure:
BEGIN
DBMS_NETWORK_ACL_ADMIN.CREATE_ACL('netacl.xml',
'Allow usage to the UTL network packages', 'USR_COMP', TRUE, 'connect');
DBMS_NETWORK_ACL_ADMIN.ADD_PRIVILEGE('netacl.xml' ,'USR_COMP', TRUE, 'resolve');
DBMS_NETWORK_ACL_ADMIN.ADD_PRIVILEGE('netacl.xml' ,'USR_DEV', TRUE, 'connect');
DBMS_NETWORK_ACL_ADMIN.ADD_PRIVILEGE('netacl.xml' ,'USR_DEV', TRUE, 'resolve');
-- Specify which hosts this ACL applies to,
-- for simplicity, we're saying all (*)
-- You might want to specify certain hosts to lock this down.
DBMS_NETWORK_ACL_ADMIN.ASSIGN_ACL('netacl.xml','*');
END;
How can I validate that both users now have the correct privileges from the old version?
Thanks in advance

Hi,
Refer thread:
11g Upgrade - Network ACL
Hope helps :)
thanks,
X A H E E R

11g Upgrade - Network ACL

I want to upgrade my oracle 10g database to 11g. the utlui112.sql script shows following -
WARNING: --> Database contains schemas with objects dependent on network packages.
.... Refer to the Upgrade Guide for instructions to configure Network ACLs.
.... USER MDMSYS has dependent objects.
According to documentation , it is not clear whether I need to install XML DB before upgrade or after upgrade to 11g.
I run the following query and result is as follows -
SQL >SELECT * FROM DBA_DEPENDENCIES WHERE referenced_name IN ('UTL_TCP','UTL_SMTP','UTL_MAIL','UTL_HTTP','UTL_INADDR')
AND owner NOT IN ('SYS','PUBLIC','ORDPLUGINS');
OWNER NAME TYPE REFERENCED_OWNER REFERENCED_NAME REFERENCED_TYPE
REFERENCED_LINK_NAME DEPE
MDMSYS MDM_JOB PACKAGE BODY PUBLIC UTL_TCP SYNONYM
HARD
MDMSYS MDM_JOB PACKAGE BODY MDMSYS UTL_TCP NON-EXISTENT
Can someone plaease help on how I can configure the network ACLs?

Hi ,
You can grant to a network and not necessary to grant each machines IP details.
Also this has to be granted to users or the principal is the schema who will be executing this utl_smtp.
If there are multiple users, then you need to grant access to each user.
You need to configure below steps to grant access to the user for utl operations.
This is a new security feature to 11g.
Please review below document :
Oracle® Database Security Guide
11g Release 1 (11.1)
Part Number B28531-06
4 Configuring Privilege and Role Authorization
Managing Fine-Grained Access to External Network Services
URL : http://download.oracle.com/docs/cd/B28359_01/network.111/b28531/authorization.htm#CIHDAJDJ
A example of the setting:
=================
If you are creating the ACL for the first time, you can directly go to step (d).
Please replace the values in < > with your environment values.
a. Drop the user privilege:(please run the below for all the users who are granted connect privilege).
BEGIN
DBMS_NETWORK_ACL_ADMIN.delete_privilege (
acl => '<mailserver_acl.xml>',
principal => '<MYUSER>',
is_grant => FALSE,
privilege => 'connect');
COMMIT;
END;
b. Unassign the network details from ACL (The ip address are only example, please replace with the
values you have specified)
BEGIN
DBMS_NETWORK_ACL_ADMIN.unassign_acl (
acl => '<mailserver_acl.xml>',
host => '<192.168.2.3>',
lower_port => <25>,
upper_port => <25>);
COMMIT;
END;
c. Drop the ACL
BEGIN
DBMS_NETWORK_ACL_ADMIN.drop_acl (
acl => '<mailserver_acl.xml>');
COMMIT;
END;
d. Create the acl again fresh:
BEGIN
DBMS_NETWORK_ACL_ADMIN.create_acl (
acl => 'mailserver_acl.xml',
description => 'Mailserver ACL',
principal => '<MYUSER>',
is_grant => TRUE,
privilege => 'connect',
start_date => SYSTIMESTAMP,
end_date => NULL);
COMMIT;
END;
e. Assign the acl to the network:(please have the ip address modified to correct IP of the machine where this utl package is targetted run.)
for example IP/hostname of mail server should be there for UTL_SMTP to execute.
BEGIN
DBMS_NETWORK_ACL_ADMIN.assign_acl (
acl => 'mailserver_acl.xml',
host => '<192.168.2.3>',
lower_port => <25>,
upper_port => <25>);
COMMIT;
END;
f.Test the package.
Thanks,
Sathya

Best way to avoid requirement for network ACL after upgrade to 11g

Hi All,
After upgrade from 10g to 11g, I found Network ACLs required to make code using SYS.UTL_SMTP to work. Otherwise there is an error: ORA-24247: network access denied by access control list (ACL).
Do you know an elegant way to get rid of ACLs? I mean to open the network for all user's code, like it was on 10g, instead of checking what is actually needing it and doing specific ACLs for users. Database parameter disabling ACL restrictions seems natural option here, but it looks like Oracle not introduced such.
Kind Regards,
Artzaw

I don't know of a way to disable ACLs, no. I'd imagine that there probably is a hidden parameter that Oracle Support could direct you to. I'm hard-pressed to imagine why you'd really want to disable that functionality, though.
You can create an ACL that allows access to an arbitrary host on an arbitrary port (host => '*.*.*.*' and with NULL lower_port and upper_port values).
Justin

Problem creating Network ACL for a ROLE in Oracle 11gR2

According to Oracle Documentation when you create a new Network ACL you can add privileges to a user or role. I need to create a new ACL for the UTL_SMTP package for a specific role, but when I granted it the users who have that role are still getting the "ORA-24247: network access denied by access control list (ACL)" error when they try to send an email. If I grant the ACL privilege to the same users directly it works fine. Is there any step I'm missing? This is the test I have made on my Solaris 10 - Oracle 11gR2 (11.2.0.3) Standard Edition server:
SQL*Plus: Release 11.2.0.1.0 Production on Wed Aug 21 09:31:52 2013
Copyright (c) 1982, 2010, Oracle. All rights reserved.
SQL> CONNECT system/******@testdb
Connected.
SQL> SET LINES 1000
SQL> SELECT * FROM v$version;
BANNER
Oracle Database 11g Release 11.2.0.3.0 - 64bit Production
PL/SQL Release 11.2.0.3.0 - Production
CORE    11.2.0.3.0      Production
TNS for Solaris: Version 11.2.0.3.0 - Production
NLSRTL Version 11.2.0.3.0 - Production
SQL> COLUMN host FORMAT A20
SQL> COLUMN lower_port FORMAT 99999
SQL> COLUMN upper_port FORMAT 99999
SQL> COLUMN acl FORMAT A40
SQL> COLUMN acl FORMAT A40
SQL> COLUMN principal FORMAT A15
SQL> COLUMN privilege FORMAT A10
SQL> COLUMN is_grant FORMAT A8
SQL> COLUMN status FORMAT A10
SQL> SELECT host, lower_port, upper_port, acl FROM dba_network_acls;
no rows selected
SQL> SELECT acl,principal,privilege,is_grant FROM dba_network_acl_privileges;
no rows selected
SQL> CREATE USER testacl IDENTIFIED BY testacl;
User created.
SQL> GRANT CONNECT TO testacl;
Grant succeeded.
SQL>
SQL> BEGIN
2     dbms_network_acl_admin.create_acl('test_smtp.xml','TEST SMTP ACL','TESTACL',true,'connect');
3     dbms_network_acl_admin.assign_acl('test_smtp.xml','localhost',25);
4     commit;
5 END;
6 /
PL/SQL procedure successfully completed.
SQL> SELECT host, lower_port, upper_port, acl FROM dba_network_acls;
HOST                 LOWER_PORT UPPER_PORT ACL
localhost                    25         25 /sys/acls/test_smtp.xml
SQL> SELECT acl,principal,privilege,is_grant FROM dba_network_acl_privileges;
ACL                                      PRINCIPAL       PRIVILEGE IS_GRANT
/sys/acls/test_smtp.xml                  TESTACL         connect    true
After creating this ACL I test it like this:
SQL> CONNECT testacl/testacl@testdb
Connected.
SQL> SELECT host, lower_port, upper_port, privilege, status FROM user_network_acl_privileges;
HOST                 LOWER_PORT UPPER_PORT PRIVILEGE STATUS
localhost                    25         25 connect    GRANTED
SQL> DECLARE
2     c utl_smtp.connection;
3 BEGIN
4     c := utl_smtp.open_connection('localhost', 25); -- SMTP on port 25
5     utl_smtp.helo(c, 'localhost');
6     utl_smtp.mail(c, 'Oracle11.2');
7     utl_smtp.rcpt(c, '[email protected]');
8     utl_smtp.data(c,'From: Oracle'||utl_tcp.crlf||'To: [email protected]'||utl_tcp.crlf||'Subject: UTL_SMTP TEST'||utl_tcp.crlf||'');
9     utl_smtp.quit(c);
10 END;
11 /
PL/SQL procedure successfully completed.
SQL>
This works fine and I receive the email correctly. Now if I try to do the same thing for a role:
SQL> CONNECT system/******@testdb
Connected.
SQL> BEGIN
2     dbms_network_acl_admin.drop_acl('test_smtp.xml');
3     commit;
4 END;
5 /
PL/SQL procedure successfully completed.
SQL> SELECT host, lower_port, upper_port, acl FROM dba_network_acls;
no rows selected
SQL> CREATE ROLE testacl_role;
Role created.
SQL> GRANT testacl_role TO testacl;
Grant succeeded.
SQL> ALTER USER testacl DEFAULT ROLE ALL;
User altered.
SQL>
SQL> BEGIN
2     dbms_network_acl_admin.create_acl('test_smtp.xml','TEST SMTP ACL','TESTACL_ROLE',true,'connect');
3     dbms_network_acl_admin.assign_acl('test_smtp.xml','localhost',25);
4     commit;
5 END;
6 /
PL/SQL procedure successfully completed.
SQL> SELECT host, lower_port, upper_port, acl FROM dba_network_acls;
HOST                 LOWER_PORT UPPER_PORT ACL
localhost                    25         25 /sys/acls/test_smtp.xml
SQL> SELECT acl,principal,privilege,is_grant FROM dba_network_acl_privileges;
ACL                                      PRINCIPAL       PRIVILEGE IS_GRANT
/sys/acls/test_smtp.xml                  TESTACL_ROLE    connect    true
SQL>
And now I test it again with the same user:
SQL> CONNECT testacl/testacl@testdb
Connected.
SQL>
SQL> SELECT host, lower_port, upper_port, privilege, status FROM user_network_acl_privileges;
no rows selected
SQL> DECLARE
2     c utl_smtp.connection;
3 BEGIN
4     c := utl_smtp.open_connection('localhost', 25); -- SMTP on port 25
5     utl_smtp.helo(c, 'localhost');
6     utl_smtp.mail(c, 'Oracle11.2');
7     utl_smtp.rcpt(c, '[email protected]');
8     utl_smtp.data(c,'From: Oracle'||utl_tcp.crlf||'To: [email protected]'||utl_tcp.crlf||'Subject: UTL_SMTP TEST'||utl_tcp.crlf||'');
9     utl_smtp.quit(c);
10 END;
11 /
DECLARE
ERROR at line 1:
ORA-24247: network access denied by access control list (ACL)
ORA-06512: at "SYS.UTL_TCP", line 17
ORA-06512: at "SYS.UTL_TCP", line 267
ORA-06512: at "SYS.UTL_SMTP", line 161
ORA-06512: at "SYS.UTL_SMTP", line 197
ORA-06512: at line 4
SQL>
I'm aware that role privileges doesn't apply inside procedures, functions or packages by default, but this is an anonymous block so it should use the active roles for the user. I also tried adding a "dbms_session.set_role('TESTACL_ROLE');" at the beggining of the anonymous PL/SQL block but I got the same access error.
Thanks in advance for any help you can give to me on this question, it would be very hard to grant the ACL to all the individual users as they are more than 1000, and we create more regularly.

Thanks for your quick reply... I don't have a problem creating the basic ACL with the privileges granted for a user. The problem appears when I try to create an ACL with privileges for a ROLE. You can see here http://docs.oracle.com/cd/E11882_01/appdev.112/e25788/d_networkacl_adm.htm#BABIGEGG than the official Oracle documentation states that you can assign the ACL principal to be a user or role:
Parameter
Description
acl
Name of the ACL. Relative path will be relative to "/sys/acls".
description
Description attribute in the ACL
principal
Principal (database user or role) to whom the privilege is granted or denied. Case sensitive.
My issue is that when I try to create the ACL for a role it doesn't work.
Have you ever created an ACL for a role? if so please send me an example or let me know which step I might be missing. Cheers.

Network ACL for two specific ports

As far as I can tell there is no way to set Network ACLs such that only two specific ports are available. I'm using Oracle 11gR2.
I'd like a HTTP port and an SMTP port open for the local loopback address. These are ports 7777 and 25. It's my understanding that you can have only one ACL per host. While it seems you can create more, any additional ACL's for the same host don't always work as expected. So does anyone have any advice as how I can do this? I'd rather not have every port between 7777 and 25 available but this is what I currently have...
DBMS_NETWORK_ACL_ADMIN.ASSIGN_ACL(
acl => 'local_loopback.xml'
, host => '127.0.0.1'
, lower_port => 25
, upper_port => 7777
);

Billy Verreynne wrote:
As far as I can tell there is no way to set Network ACLs such that only two specific ports are available. I'm using Oracle 11gR2.>Not so in my experience. An ACL can be for a specific target, but contain multiple ports for that target.
E.g. I assign ports 80, 7777, 8080, and a few others, in a single web-acl.xml, to a network target (host or domain).
Read the usage notes in Oracle® Database PL/SQL Packages and Types Reference.>Thanks I'll try that. I think we had problems in the past with separate ACL's containing rules for the same host, the response we got back from support was not to do that. This way didn't occur to me.

Leopard upgrade = no wireless networking

I upgraded my Mac Mini (1.83 GHz Core 2 Duo) to Leopard the other day. Took it to 10.5.2 right after the upgrade.
Everything worked flawlessly for about 2 days.
Then the AirPort networking started dropping it's connection. I have a Wireless Router setup right beside the Mini which it now just barely picks up (1-2 bars) and drops the connection every few hours.
And I can no longer browse / see any of the other wireless networks in my neighborhood.
My MacBook which I also upgraded to Leopard is working fine. Full signal strength and can see the 5-10 other networks in my vicinity.
The Mac Mini was also working perfectly fine before I upgraded to Leopard.
I tried deleting the com.apple.airport.preferences.plist as some posts suggest but that doesn't work. I also did a SAFE mode boot to no avail. There seems to be other Mini owners with similar problems but no solutions.
I don't want to revert to 10.4 ... any suggestions?

I'M HAVING THE SAME ISSUE ON AN OLDER POWERBOOK G4 (TITANIUM). I CALLED APPLE SUPPORT AND THEY TRIED SEVERAL CHANGES TO AIRPORT SETTINGS (SUCH AS CHANNEL CHANGES). NO SUCCESS. THEIR LAST WORDS TO ME WERE...WELL, LEOPARD REALLY WASN'T BUILT TO RUN ON OLDER MODEL LAPTOPS. THIS, OF COURSE, IS A CROCK OF S__T AS THE LAPTOP MEETS ALL TECHNICAL SPEC REQUIREMENTS FOR LEOPARD
WHAT'S UP APPLE? SHAME ON YOU FOR NOT ADDRESSING THIS ISSUE. IT'S ALL OVER YOUR DISCUSSION BOARDS BUT YOU REMAIN SILENT. IT'S DISGUSTINGLY ARROGANT.

Windows 8.1 Pro upgrade = No Wifi Network USB N+ "working normally"

Hello,
I used the Microsoft store to download the Windows 8.1 Pro upgrade.
After I got everything started, there is no WiFi connection.
I don't mean it is having trouble connecting to Wi-Fi, I mean it shows no Wi-Fi at all. The "troubleshooter" only wants me to connect a cable to the network. The wireless signal graph shows a RED X overlaid on it and does not pick up any wifi signals-
not only that, but it does not even LOOK for WiFi signals.
Device manager shows my Belkin USB N+ wireless network adapter as working normally.
Using suggestions from an 8.1 preview problem I have tried disabling/re-enabling, re-installing updated drivers from Belkin.com to no avail. The computer thinks the device is working normally. What the computer thinks the device is supposed to be doing while
working normally is anyone's guess.
There is nothing wrong with my Wi-Fi. Every other computer and cell phone that uses the connection is fine. This is a Windows 8.1 issue. Please help!
[Someone suggested updating BIOS. Not sure why, the computer was working PERFECTLY until the Windows 8.1 Pro free upgrade. ]
edit: this is 32 bit Win 8.1 (I assume it doesn't upgrade from 32 to 64 bit just because my system is capable of it) on a Zt systems PC with Core2 Quad processor and 4GB Ram if that makes any difference.

I have had the exact same problem as you have. contacted Microsoft techs but they could not solve the problem at all and had me revert back to windows 8 pro which now recognizes the wireless. I suggest you go back to windows 8 if you need to
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Try the iPhone 3G forum. You will find more help in there.

MS Access querying SQL Server: How to configure Network ACL?

I need to set up a highly restrictive ACL for access to a particular SQL server in our network. This ACL will reside on our core switch at the "front door" of our network and permit access to the SQL server only using the ports that
are necessary. The purpose is to A) Try to keep unauthorized users from gaining access to the host server and B) Should someone somehow gain unauthorized access to the host server. keep them from being able to "hop off" to other PC's on
the network.
The server will be accessed by clients using MS Access to query the SQL database and bring back reports. A few admins are actually able to make minor changes to the database such as updating a user list or location list. In other words, both
read and write access is needed to the SQL database.
I know that the default SQL server port is 1433, but according to a Microsoft Support article I read, "client ports are assigned a random value between 1024 and 5000".
I was really hoping I could just put something like "permit PC1 access to SQL Server on Port 1433" in my ACL, but after reading the MS Support article it sounds like I've got to allow almost 4,000 ports through?
Could someone help demystify this for me so I can build the right ACL?

The tool to use is SQL Server Configuration Management.
But what you can configure is which port SQL Server listens to. Which port the client listens to is not controllable as far as I know. But that can of course be many, since a client can have many connections to SQL Server. (And the range is not
restricted to 1024-5000. I connected over TCP locally, and I see this with netstat -a
TCP 127.0.0.1:6621 NATSUMORI:ms-sql-s ESTABLISHED
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Erland Sommarskog, SQL Server MVP, [email protected]

Can't install iTunes upgrade due to network error

I've never had a problem downloading & installing iTunes updates, but I've been trying for a week or two to update iTunes and I'm always getting the following error message:
A networking error has occurred: timed out (-1001). Make sure you can connect to the Internet, then try again.
There is NOTHING wrong with my Internet connection, and all my other Apple updates have installed successfully. I have NO idea how to try to fix this problem. Please help!!!

I am getting this same message but only after the 38.5MB iTunes file has downloaded. Last week a forum named "can't download" also had several user posts with this same problem but I don't see it now. Thought I'd try upgrading again today but it still doesn't work. Does Apple read these posts?

ACS Upgrade in live network ok?

I am about to upgrade our CiscoSecure ACS from 4.1 to 4.2. If I do so on a live network, can that affect anything within my network?
I would hate to bring down an entire network and upset about 3000 users.
Thanks in advance!

That will prevent that particular ACS to authenticate new users for the time of the upgrade ...
Existing users won't be kicked out unless you configured a very frequent reauthentication timer.
If you have more than one ACS then the other should be there to take the job

E71 firmware upgrade for A1 network - Nokia unable...

Hi,
Nokia, please make firmware v210 available to product code 0570359.
i have an E71, use it heavily in business and have standardized our company on it and need to upgrade it to v210 firmware, because the v100 is so buggy. i had 7 email interactions with nokia support and a1 support but both point the finger to each other and are of no help. so the last option is to use the forum, before i feel forced to switch my company over to the iPhone because of lack of nokia software support and upgrades.
the network provider A1.net says they have accepted firmware 200.21.118 already last year and informed Nokia in December 2008 to release v200 for this product code 0570359. A1 even says they have reconfirmed now again that the acceptance of the firmware has reached nokias support team. but when I check the nokia updater and the nokia website, it still says my firmware v100 is the latest. I know that even firmware v210 exists, know the list of fixed issues, so I actually want that one.
Is there anyone out there to help with this mess and help nokia from loosing even more business users over to the iPhone?
Bernd G.

first of all, it isnt Nokias fault. once firmware is released, they do their very best to roll it out and usually achieve this in a few eeks to most regions for their generic product codes (i.e. firmware that is not operator-branded). in your case, there is some kind of miscommunication between your operator (A1) and Nokia, that has resulted in the delay of firmware released for your particular product code. Nokia simply provide the firmware to A1, who then decide whether to actually release it or not with their logos and whatnot all over it (i.e. operator customisation) or if they do not, they will not release the firmware to the users. so all you can do is haggle A1 about it and hope they hurry up and release the firmware.
another option is to ask the A1 guys to sign a release so that you can take your phone to your local Nokia Care Centre and have it flashed with generic firmware. although this is often unlikely to happen as customer service for operators usually do not know what users are talking about when you request this, or are too stubborn/lazy to allow it to happen. but nevertheless, you can try anyway and maybe something good can come out of all this.
If you found this or someone's comments helpful or like what that person has to say, please give some Kudos to their post!

Purchased QNAP 469-Pro NAS, need your assistance upgrading my home network components

Hi everyone,
First of all, I apologize if I am posting my question in a wrong sub-forum. Having said that, I've recently purchased a QNAP 469-Pro NAS -- http://www.qnap.com/en/index.php?lang=en&sn=822&c=351&sc=513&t=520&n=9786 -- that has dual gigabit lan ports. The unit also supports link aggregation ( otherwise known as port trunking or IEEE 802.3ad). Currently I have a WRT 610N wireless router and a TP-Link 8 port gigabit switch that does NOT support link aggregation. Now, I would very much appreciate it, if you helped me by teaching me how to best upgrade my network components so as to fully utilize the performance (or come close as much as possible to the advertised performance) of 221.8 MB/sec Reading, 220.8 MB/sec Writing mentioned on QNAP's website. I have all of my files (movies, music, personal data files, etc) stored on the NAS. I get roughly an abysmal ~38Mbs right now. My household uses the NAS constantly to stream from and download to the NAS. Any help would be greatly appreciated. Many thanks in advance....
P.S.. There are two MB Pros (2010 Core I7, 8GB ram) and two iPads (2) that are most of the time connected to the networking either watching something or browsing the web.
Amir

What if I use SLM2008 for the switch? Then all i need is a wireless router that gives me a perfomance closer to the rates I have mentioned in my original post ( actual throughput, not advertised rates).

After Lion Upgrade, iChat: "a network error occurred"

After upgrading to Lion, I seem to be having a lot of network issues. One of the most common is in iChat. I continue to get the error "a network error occured" when trying to connect. Anyone else having the issue with Lion?

Hi all,
I am linking to J-a-x's post as it has the relevant info.
The changes to the Server names and Ports are held in the .plist for the suport app that does the iChat Logins
This support app also does the sam job for Face Time and launches when the computer starts up.
The support app is called IMAgent.
It is a "known" issue that some Upgrades to Lion that involve Migration or straight Upgrades on working computer does seem to have issues with info transferred from iChatAgent (Snow Leopard and Earlier) to iChat6/IMAgent/Lion
Good Info in the DNS servers of System Preferences > Network > Advanced Button > DNS tab seems to help.
Another thing that seems to work in opening Activity Monitor and finding IMAgent and then using the Quit icon And Confirming Force Quit (It immediately restarts).
As johna498 says also deleting the account info in iChat and re-entering it also seems to work. (It writes the account info to com.apple.imagent.plist (again) (As Does J-a-x's Server name "workaround").
10:44 PM Thursday; December 15, 2011
Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"
 iMac 2.5Ghz 5i 2011 (Lion 10.7.2)
 G4/1GhzDual MDD (Leopard 10.5.8)
 MacBookPro 2Gb (Snow Leopard 10.6.8)
 Mac OS X (10.6.8),
"Limit the Logs to the Bits above Binary Images."  No, Seriously

Upgrade to 11 Network ACLs

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