Outlook error 0x80040115 - can recieve but not send

I have one client running Outlook 2003 with Exchange 2003. He receives email fine but can't send. We get the error
"Task 'Microsoft Exchange Server - Sending' reported error (0x80040115) : 'The connection to the Microsoft Exchange Server is unavailable.  Outlook must be online or connected to complete this action.'"

the computer is online and Outlook says it is connected. I created a new profile and I have the same problem. It also does not work when I open Outlook in safe mode.

I configured Outlook to use a proxy server and to use it for fast and slow connections. Sometimes this forces a username and password dialog box to come up. When that happens we can enter the information and it works for a short time.

I also installed Office SP3.

There are no errors in server or workstation event logs.
ajdratchAsked:
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ajdratchConnect With a Mentor Author Commented:
Sorry for the delay in getting back to this. He just swapped out computers and we formatted the one having problems.
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Rajith EnchiparambilOffice 365 & Exchange ArchitectCommented:
Is this a LAN connection (MAPI) or Outlook RPC Over HTTP?
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ajdratchAuthor Commented:
I was a default Exchange configuration until I added the proxy settings. Now it is RPC over HTTP
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Rajith EnchiparambilOffice 365 & Exchange ArchitectCommented:
Why do you want to use RPC Over HTTP inside LAN? Is any of your client successfully using RPC Over HTTP?
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ajdratchAuthor Commented:
I only configured rpc to troubleshot this issue. This seems to help but it is still hit or miss. This is the only computer having this problem
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Rajith EnchiparambilOffice 365 & Exchange ArchitectCommented:
Changing the way emails are accessed won't correct the original problem. Does the problem follow the user to a different PC? If so, then its down to the PC or user profile.
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jawad1481Commented:
Which is the antivirus on the client machine ? try disabling it.
 
try this let me know.

Thanks.
Jawad.
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jawad1481Commented:
HI!
 
I belive user in in cached mode. Try getting him in online mode  and then check send / receive emails.

Thanks.

Jawad.
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