MAPI_E_NETWORK_ERROR (not logged in) Redemption (using Outlook not MAPI standalone)

Question

I have got my application working fine with the standalone MAPI (1.2.1 CDO) however after removing that and installing Outlook, I cannot get it working.

I get a MAPI_E_NETWORK_ERROR, which when I catch and return the exception message caught comes up with

System.Runtime.InteropServices.COMException: Not logged on. Please log on first

Do I have to do anything different to get this working with an outlook installation? This is thrown when doing

LogonExchangeMailbox(username, exserver)

What version of Exchange are you connecting to? – Dmitry Streblechenko Feb 08 '16 at 13:44 — Dmitry Streblechenko, Feb 08 '16 at 13:44
Sorry should have included that - it's 2010. – John Joseph Feb 08 '16 at 14:04 — John Joseph, Feb 08 '16 at 14:04

score 1 · Answer 1 · answered Feb 08 '16 at 15:13

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MAPI_E_NETWORK_ERROR is a network access error. Is firewall active on that machine? Was your app added to the exclusion list?

answered Feb 08 '16 at 15:13

Dmitry Streblechenko

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score 0 · Answer 2 · answered May 31 '17 at 10:48

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It could also be the name of the exchange server not being correct. I had this issue as the old exchange server had been decommissioned so rather than being EXHANGE.ad.{company}.com it changed to just the new server name e.g. EXCHANGEABC12.

answered May 31 '17 at 10:48

Andy Creigh

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score 0 · Answer 3 · answered May 31 '17 at 15:10

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Also keep in mind that LogonExchangeMailbox connect using plain old RPC protocol. If you are connecting to Exchange 2013/2016 over RPC-over-HTTP, you need to use LogonHostedExchangeMailbox .

answered May 31 '17 at 15:10

Dmitry Streblechenko

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MAPI_E_NETWORK_ERROR (not logged in) Redemption (using Outlook not MAPI standalone)

3 Answers3