Messages.app can't connect to AIM/GChat/FB Jabber, AIM.app works

Since updating to 10.8 on my 2011 MBP, I've had a ton of trouble with Messages.app .  It seems to work consistently from home on a Frontier DSL behind a 2003-era Airport Extreme.  However on my business network (Comcast, behind Sonicwall TZ170 & Windows 2003 SBS server), connection is inconsistent at best.  This morning, I'd left my MBP logged in & sleeping from home, and plugged in at work.  Messages remained logged in to AIM, GChat & Facebook via Jabber.  However, after a restart, those services will not reconnect.
Messages lost the connection to the AIM account “xxxx”. A network error occurred.
Messages lost the connection to the Google Talk account “xxxxx”. A network error occurred.
Following other tips on here, I've dumped a variety of .plist files, removed my accounts & added again, set preferences to use separate Buddy lists, and checked/unchecked/checked again the use SSL options.  This started to feel like a DNS issue.  But, I'm running XPsp3 via VirtualBox, and that computer's AIM & Yahoo connections on Trillian work just fine.  Then I downloaded & installed the official AIM.app, and it also connected without issue.  I can ping each of those hosts from the command line.
Before upgrading, I had been using iChat on 10.4/10.5/10.6/10.7 with those account without problem. Strangely, Bonjour rarely connected under those configurations but does now every time.  iMessages work properly.

Hi,
The default GoogleTalk login is on port 5223 as it is a Jabber SSL login.
However it can be made to work on port 443 (with SSL Left On)
Log out of the GoogleTalk account in the Messages > Preferences > Accounts > Google option > Account info tab
In the Server Setting Tab you can now change the port to 443
This is likely to help where the Connection to the Internet only allows default ports.
The AIM login in Messages is now on port 443 (regular posters have been saying use this since iChat 3)
It also changed the server name from iChat 6 to api.oscar.aol.com
Adium still uses the older login.oscar.aol.com In earlier versions of iChat this gained a leading "s" when using SSL
By default most domestic routers will have ports up to 1024 open (allows Web Browsing Secures logins and Mail plus FTP) - there are 65355 ports in all and some of the ports used for Logins in Messages and Video or Audio chatting are above this 1024 threshold.
I am a little surprised that the computer stayed logged in as you changed networks.
If not using SSL it is likely the AIM one was dropped and Automatically reconnected.
If the app is supposed to start when the computer does then there could be issues if the network is not established by the time Messages has finished Launching.
The fact the Bonjour Account is connecting means it is not the DNS issue.
Bonjour relies on mDSN (multicast DNS) and this in turn need DNS to be working.
http://support.apple.com/kb/HT3789
10:37 PM      Monday; July 1, 2013
  iMac 2.5Ghz 5i 2011 (Mountain Lion 10.8.4)
 G4/1GhzDual MDD (Leopard 10.5.8)
 MacBookPro 2Gb (Snow Leopard 10.6.8)
 Mac OS X (10.6.8),
 Couple of iPhones and an iPad
"Limit the Logs to the Bits above Binary Images."  No, Seriously

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