Connection to AIM unexpectedly lost

Very often when I am not using iChat, my buddy list will all of a sudden switch to "Disconnected" and I will get a message saying "The connection to the host was unexpectedly lost." iChat used to work just fine! What can I do to get it back to the way it was?

How to get iChat AV working again

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AIM - connection with host unexpectedly lost

When I am using my school's wireless internet, I can log onto iChat for about a minute, and then it logs off and says "Lost Connection with AIM. The connection with the host was unexpectedly lost."
If I stay on the iChat window it stays logged on, but if I bring another application to the front of the screen it eventually logs off.
I also cannot use video chat.
I found a similar thread that said to use port 443, which I am currently using.
It does the same thing even if I am logged in to my .mac account. However, Adium works and everything works fine when I am at home or somewhere else. As far as I know, my proxy information for my school's wireless is correctly entered in.

Hi,
Welcome to the  Discussion Pages
iChat is very sensitive to Proxies.
In fact I would say it does not like them at all based on the posts in these forums. Many people report they can not get it to work with a proxy whether it is listed in the iChat > Preferences > Accounts > Server Settings or in the System Preferences > Network.
I don not use Proxies and still find at some points iChat does not seem to be able to stay logged in.
I never use another client long enough to provide a comparison.
iChat gets constant feedback from the AIM servers to keep the Buddy List updated. More so than a Minute check setting by Mail - so I can not see it is any time-out limit on the proxy.
Isn't iChat using port 1080 for the Proxy ? (or whatever your Proxy uses )
10:49 PM Wednesday; April 2, 2008

"connection to host unexpectedly lost"

what does this mean and how do i fix it? i created an AIM account, and this is what happens when i try to log on to ichat using AIM...please help?

i'm really not an expert with iChat or Macs in general but that same thing was happening to me. all i did is i opened ichat and then up at the top i clicked on iChat>Preferences>Accounts>Server Settings. under "server settings" it should list the server and port. i think the default port is 5190. i just typed in 443 as the new port # and it worked fine. now you can't change it while AIM is running. so you'll have to click offline and then change it. i hope that makes sense. hopefully it'll work.

Every time I try to sign on it says that ichat lost the connection to the AIM account and the server connection was unexpectedly lost. How can I fix this?

Every time I try to sign on it says that ichat lost the connection to the AIM account and the server connection was unexpectedly lost. How can I fix this?

Note For others.
For the Port Changes (or server names in some cases) you have to be logged out to make changes on the Server Settings pane.
9:41 PM Friday; October 28, 2011
Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"
 G4/1GhzDual MDD (Leopard 10.5.8)
 MacBookPro 2Gb( 10.6.8)
 Mac OS X (10.6.8),
"Limit the Logs to the Bits above Binary Images."  No, Seriously

The connection to the host was unexpectedly lost. AIM

I am trying to connect to AIM via iChat in Mac OS X Tiger. Everytime I try to connect it shows my buddy list for about 1-2 seconds and then says, "The connection to the host was unexpectedly lost." I don't have aim connected on this computer or any other computer on the network when I try. Any help or recommendations are appreciated.
Thanks

124333.047765 Loading hardware rules from hardwarerulesH264-G4.plist
124333.047851 Checking H264 hardware rules
124333.047889 Satisfied rule #1 (20:640x480)
124333.048134 setLocalUserName: myname@myip
124333.174734 Default video size is (640x480)
124333.318247 ### NEW STATE: to: VC_INIT, from: VC_INVALID
124333.319157 ### NEW STATE: to: VC_IDLE, from: VC_INIT
124333.319198 ++++++++ confStatusMapRemoveAll
124333.319238 ( ) -- mapUserIDToSecurityInfo cleared --
124333.319423 UPnP init passed
124333.319569 NATTraversal created
124333.319697 QT automatic setting = 16777216
124333.319708 Bandwidth based on QT prefs = 0
124333.382414 UPnP Router Info:
- manufacturer [NETGEAR, Inc.]
- friendly name [Residential Gateway]
- model name [RangeMax(TM) Wireless Router]
- model desc [RangeMax(TM) Wireless Router]
124333.382654 UPnP: Begin TCPProc
124335.591339 BWD: cache: '[myip:255.255.255.0]' != '[myip:255.255.255.0]'
124335.591361 BWD: Launching thread to determine focus capability based on bandwidth.
124335.591509 QT automatic setting = 16777216
124335.591541 BWD: Using QuickTime value: 0
124335.591569 BWD bandwidth: 0 kbits up, 0 kbits down.
124335.591595 videoNetworkCapable: 0 -- 0 max participants.
124335.591628 audioNetworkCapable: 0 -- 0 max participants.
124335.591710 vcCapabilities returns: 0x00000007
124335.591738 VCCapAudio
124335.591838 VCCapVideo
124335.591912 VCCapMultiAudio
124335.830696 BWD Configuration Data: bwdstart://snatmap.mac.com:16384
bwdcount:1
(16384/1)
124335.830753 Connect to bwd server:16384/1 from configuration file.
124335.840447 Found 1 cameras:
124335.840516 Built-in iSight - -46137344
124335.842033 selectCameraByGUID: -46137344 returned 1
124335.847738 BWD_GetBandwidth: SendRequest (from :16392)
124335.882925 BWD_GetBandwidth: GotResponse
124335.898912 Microphone devices:
124335.899039 Internal microphone
124335.899114 Line In
124335.899175 selectedCamera GUID returned Built-in iSight
124335.913958 selectedCamera GUID returned Built-in iSight
124335.914034 Selected mic: Built-in Mic / imic
124335.914177 Found 1 cameras:
124335.914210 Built-in iSight - -46137344
124335.914256 selectedCamera GUID returned Built-in iSight
124335.916223 Microphone devices:
124335.916299 Internal microphone
124335.916369 Line In
124335.916407 selectedCamera GUID returned Built-in iSight
124335.916457 selectedCamera GUID returned Built-in iSight
124335.916503 Selected mic: Built-in Mic / imic
124335.916584 Found 1 cameras:
124335.916601 Built-in iSight - -46137344
124335.916639 selectedCamera GUID returned Built-in iSight
124335.918550 Microphone devices:
124335.918625 Internal microphone
124335.918712 Line In
124335.918746 selectedCamera GUID returned Built-in iSight
124335.918795 selectedCamera GUID returned Built-in iSight
124335.918856 Selected mic: Built-in Mic / imic
124336.650053 BWD cache: saving [myip:255.255.255.0]:433131/[email protected]
124336.651405 GotBandwidth: 433131/2532198 (up/down) @[myip:255.255.255.0]
124336.652837 BWD bandwidth: 433 kbits up, 2532 kbits down.
124336.652849 videoNetworkCapable: 1 -- 3 max participants.
124336.652859 audioNetworkCapable: 1 -- 9 max participants.
124336.652889 Focus Capability (after BWD):
124336.652921 audioHardwareCapable = 1
124336.652943 maxAudioParticipantsBasedOnHardware = 9
124336.652967 audioNetworkCapable = 1
124336.653029 maxAudioParticipants = 9
124336.653060 canBeAudioMultipointParticipant = 1
124336.653088 videoHardwareCapable = 1
124336.653119 maxVideoParticipantsBasedOnHardware = 3
124336.653147 videoNetworkCapable = 1
124336.653177 maxVideoParticipants = 3
124336.653205 canBeVideoMultipointParticipant = 1
124336.653236 detectedUpstreamKbits = 433
124336.653264 detectedDownstreamKbits = 2532
124336.653294 Sending VCCapabilitiesDidChangeNotification
124336.653520 BWD: GotBandwidth: 433131/2532198 (up/down) @[myip:255.255.255.0]
124336.653535 BWD bandwidth: 433 kbits up, 2532 kbits down.
124336.653543 videoNetworkCapable: 1 -- 3 max participants.
124336.653564 audioNetworkCapable: 1 -- 9 max participants.
124336.653628 vcCapabilities returns: 0x0000003f
124336.653651 VCCapAudio
124336.653698 VCCapVideo
124336.653720 VCCapMultiAudio
124336.653765 VCCapMultiVideo
124336.653795 VCCapMultiAudioHost
124336.653823 VCCapMultiVideoHost
124336.654917 BWD: Launched thread done.
124336.655078 Found 1 cameras:
124336.655123 Built-in iSight - -46137344
124336.655171 selectedCamera GUID returned Built-in iSight
124336.657146 Microphone devices:
124336.657220 Internal microphone
124336.657309 Line In
124336.657346 selectedCamera GUID returned Built-in iSight
124336.657396 selectedCamera GUID returned Built-in iSight
124336.657452 Selected mic: Built-in Mic / imic
124336.672544 Found 1 cameras:
124336.672585 Built-in iSight - -46137344
124336.672634 selectedCamera GUID returned Built-in iSight
124336.674617 Microphone devices:
124336.674691 Internal microphone
124336.674783 Line In
124336.674822 selectedCamera GUID returned Built-in iSight
124336.674871 selectedCamera GUID returned Built-in iSight
124336.674930 Selected mic: Built-in Mic / imic
124336.675028 Found 1 cameras:
124336.675045 Built-in iSight - -46137344
124336.675095 selectedCamera GUID returned Built-in iSight
124336.677030 Microphone devices:
124336.677205 Internal microphone
124336.677354 Line In
124336.677459 selectedCamera GUID returned Built-in iSight
124336.677563 selectedCamera GUID returned Built-in iSight
124336.677665 Selected mic: Built-in Mic / imic

"The connection to the host was unexpectedly lost" Cannot log into AIM

Every time I try to log into ichat, using AIM service I get this message...
The connection to the host was unexpectedly lost.
However, I can log onto ichat on my other mac. (macbook) And I can access AIM from AIM program on my windows computer....
Everything in preferences is configured right...Can anyone shed some light onto this?
thanks,
Joel

I have this problem, using ichat only (not using aim directly) and posted before in another thread with essentially the same name as this one. I tried all the solutions offered and none worked. BUT I did "solve" my problem. Here's how:
Solution number 1) I connected my macbook via an ethernet connection directly to my cable modem. No other changes at all, no further problems, was able to use ALL features of ichat immediately and quite well (audio and video).
Solution number 2) Since we have several computers at home, we must use a wireless router, a Netgear router. If I connect to the router (which then connects to the cable modem), ichat does not work, and I get the exact message as in this subject line. Going to the Netgear router settings (changing nothing on my macbook), I changed ONE thing only: I disabled the SPI firewall. Then, no problem using ichat to chat, but I still can't use audio or video features.
Hope this helps. For me, it diagnosed the problem with using basic ichat: the SPI firewall on the router. Also, the audio/video problem is a router problem too, which I do not yet know how to fix.
Since I am timid and fearful, I do not want to leave the SPI firewall permanently disabled.

"Lost connection with AIM" error message

Hi all,
I've been a long-time iChat user — I've had very few problems, but now, at home, whenever I've been connected for about 10-15mins, iChat just disconnects with the simple iChat Connect Alert that the app has "Lost connection with AIM. The connection with the host was unexpectedly lost."
My Buddy List collapses to a "disconnected" header and I diappear from my Buddies' buddy lists. If I'm in the middle of a chat (video, audio or text), the chat continues uninterrupted, but I still disappear from people's lists as if I'd disconnected manually. Weird.
The net result is that I have to keep checking to see if I'm connected and then reconnecting all the time. A real pain in the proverbial.
It only happens at the house. My laptop doesn't disconnect if I'm at the office, for instance.
I have cable, coming in to Netgear 814v2 router; out to an 8-port gigabit switch, which then feeds my three main machines. All via ethernet cabling.
All machines have the same problem described above.
I've made the usual Quicktime setting changes.
I've listed the necessary ports in my Mac firewall settings (even though the firewall is turned off).
Each machine has a dedicated IP issued by the router (10.0.0.2 thru 10.0.0.5)
The router firmware is up to date.
What else is there?! I have no problems initiating or joining any sort of chat with my buddies around the world. I have excellent bandwidth. My internet and email are never interrupted 24/7.
Can someone help me? Pretty please?
17" Powerbook G4 & Dual G5 2.5Ghz Mac OS X (10.4.7)

Hi
Try this log on to AIM on port 443 rather than port 5190
Go to IChat > Preferences > Accounts.
Log out of AIM and then use the Server Settings tab
Set the port to 443.
Log back in again.
Tony

"The connection to the host was unexpectedly lost"

Occasionally when I try to log in to my AIM account, I get the message, "The connection to the host was unexpectedly lost." This happens randomly and if I keep pushing it, sometimes it will let me on. It seems to be entirely at the will of the computer.

Try the Combo Update to get to 10.4.11
PCC computer use this http://www.apple.com/downloads/macosx/apple/macosx_updates/macosx10411comboupdat eppc.html
Intel ones use this http://www.apple.com/downloads/macosx/apple/macosx_updates/macosx10411comboupdat eintel.html
9:16 PM Wednesday; March 31, 2010
Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"

Connection to the host was unexpectedly lost.

I'm still having problems connecting to AIM using iChat. I switched to port 443, and I still get the message that the connection to the host was unexpectedly lost.

Ok,
Do you have individual wall sockets ?
Do you have a router in the room ?
IS your Wireless card set up for Interference Robustness ?
How are the ports opened in the modem ?
UPnP for two computers ?
7:45 PM Monday; September 10, 2007

What does this mean?? "The connection to the host was unexpectedly lost."

i get this 95% of the time i try to login:
The connection to the host was unexpectedly lost.
it then closes
i go thru AIM
_*someone please help*_
Message was edited by: migueliguel
Message was edited by: migueliguel

Hi
Try logging on to AIM on port 443 rather than port 5190.
Go to IChat in the menu bar > Preferences > Accounts.
Log out of AIM and then use the Server Settings tab
Set the port to 443.
Log back in again.
Tony

Netgear + "The connection to the host was unexpectedly lost"

I have an 802.11g Netgear router. I just got it, previously I had the exact same router, but 1 "version" behind.. aka it was gray and this one is white, but everything else SEEMS identical.
Everytime I try to connect to iChat now, I get the message:
"Lost connection with AIM
The connection to the host was unexpectedly lost."
My buddy list starts to come up, that message appears, the buddy list closes, and I'm screwed.
I am set to the DMZ. I am using port 5190, but 5191 and other ports work.. but I cannot use audio or video chatting. My client shows up as "not capable" of audio or video (MBP so I'm capable of both, and did both before this new router).
Help is appreciated, and I will gladly hand out cookies to anyone who can help.

Hi
Try this log on to AIM on port 443 rather than port 5190.
Go to IChat > Preferences > Accounts.
Log out of AIM and then use the Server Settings tab
Set the port to 443.
Log back in again.
Tony

IChat lost connection to AIM!?!?!?!

Everytime I try to go on to iChat this message pops up "iChat lost connection to AIM. The connection to the host was unexpectedly lost." Any help?!?!

Help! I've got the same problem and I've tried - port 443, 1080, 5091 and neither works. I can ping the aol server, use msn, but I cannot connect to AIM with ichat or with the standalone version AIM 4.7 for the mac. The web version doesn't seem to work either. I started a new account and i got the same error message at login - could not connect to aim - the connection tot he host was unexpedtedly lost. I am at a school, but the network guys have said that the application isn't being blocked and the ports should be open. I have a wireless macbook with os x tiger and a wired imac intel with os x tiger and neither work. any suggestions?

"Lost Connection with AIM" repeatedly

Hi there,
I'm using a new Linksys WRT54GL router with the DD-WRT v23 firmware -- which is otherwise fabulous, by the way -- but since going with the router iChat has been pretty unreliable. I can't connect to my sister in England (I'm in Canada): we keep getting "insufficient bandwidth" errors (I'm on a very hi-speed cable internet connection, so I don't think it's me!). Moreover, AIM frequently kicks me off iChat with the message "Lost connection with AIM".
I've configured my router using instructions linked from this forum. I'm forwarding the following ports to my computer:
5060
5190
5220
5222
5678
16384
And while I can connect to other users okay (except my sister, it seems), staying connected it a real issue. Can anyone recommend a fix?
Thanks,
Aaron.
PowerBook G4 15-inch 1.67 GHz Mac OS X (10.4.5) The last PowerBook ever!

Hi Aaron,
This last port should be a group of 20 ports (16384-16403)
iChat needs 4 ports from this group to do 1-1 Audio or Video chats.
Many Linksys have UPnP. It is found in the Administration tab. If you have this you could use this. Disable the Port Forwarding if you do.
Also port Forwwarding points to one IP/computer. If this is the case for you and you still have the device doing DHCP there is a cance you computer's IP has changed if it goes to sleep or is shut down when the lease time runs out.
Check this on your computer and the Port Forwarding settings.
10:26 PM Monday; February 27, 2006

Constantly get "The connection to the host was unexpectedly lost."

When I try to use IChat at home on my PowerBook I get "The connection to the host was unexpectedly lost." as soon as I try to connect. This does not happen at work though. It works fine at work.
I thought it might have something to do with the different ISP's or Router settings on my Netgear wirless router. (At home I connect via ethernet cable.) However it WILL work at home about 5% of the time.
ANy Ideas to troubleshoot?

Hi Scuba Dan,
Check that Systrem Preferences > Quicktime > Streaming tab has the drop set to your Download speed.
http://www.ralphjohnsuk.dsl.pipex.com/page4.html#_quicktime
Also check iChat > Preferences > Video Section Bandwidth drop down is set to NONE.
http://www.ralphjohnsuk.dsl.pipex.com/page4.html#_bandwidth
These two will cap iChat if not set properly.
As Defcom says if these settings are correct you may have a modem that is having trouble wiith forwarding port 5190 on both TCP and UDP protocols.
Changing the setting he mentions drops the login below any Port Forwarding and NAT involvement on your modem and router.
Having said that avoiding NAT and Port forwarding by using UPnP is another way around this. Most Netgears have UPnP enabled as default. You don't need Port Forwarding ANd UPnP. Disable the Port Forwarding settings by Unchecking them.
For others,
Zyxel devices are prone to needing port 443, as are newer devices that want protocols to be set when Port Forwarding.
10:56 PM Tuesday; October 17, 2006

IChat: "The connection to the host was unexpectedly lost"

I have I will be talking to people on iChat and will not recieve responses from anyone for a while then suddenly i am kicked off and the error message "The connection to the host was unexpectedly lost" appears. I will log back on and the people whom I was talking to say they were sending me messages and they didnt get any of the messages i had sent.
Thank YoU!!!

Hi Samantha,
Have answered here.
3:50 PM Wednesday; March 1, 2006

Connection to AIM unexpectedly lost

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