Resolved – Exchange Server is unavailable

Avatar Nikita Garg Updated On - 30 Dec 2019

The error “Exchange Server is Unavailable” is frustrating and annoying for any Outlook user. Sometimes, the error gets resolved on its own but may be repeated later. Therefore, we need to find solutions for this error. Before that, let us see the reasons behind this error:

What causes error “Exchange Server is Unavailable”?

Poor Network Connection:
If your network connections are not proper, then the connection to Exchange Server might get disturbed causing server inaccessibility.

Incorrect Outlook configuration:
When Outlook profile is incorrectly configured y, then there are chances for errors. Due to this, connection to Exchange Server may not get adequately established.

Fix the error “Exchange Server is Unavailable”?

There are a few manual solutions to resolve this error. Let us see some of them:

Editing Registry Values

Incorrect registry settings can be a reason for the error “Exchange Server is Unavailable.” To fix this issue, you need to modify it. Follow the steps to edit the registry values:

  1. Press Windows+R, type Regedit and click OK.
  2. Click Yes button on permission box. Then a Registry Editor window will get opened. In it, find HKEY_CURRENT_USER and then select Software in it.
  3. Registry Editor  window

  4. Now, navigate to Microsoft>Office>Outlook>RPC.
  5. On File, go to Edit, click New > DWORD.
  6. Type DefConnectOpts and press Enter.
  7. Right-click DefConnectOpts and click Modify. Give it value 0 and click OK.

Thus, the registry value has been modified.

Through Cache Resetting

Outdated storage data in the cache might be the cause for Exchange unavailable error. Using flushdns command, you can overcome this issue. This command execution will automatically delete the outdated information by resetting DNS cache server.

In Command Prompt (as administrator), run: ipconfig/flushdns
After the execution, close the Command Prompt. Then, try to connect Exchange Server once again.

With Third-Party Professional Software

When “Exchange Server is Unavailable,” you may not be able to perform emailing activities. But you can convert the OST files to PST and use in Outlook to establish email commutation. This conversion can be done using Kernel for OST to PST tool.

When you want to move OST data to some other platforms, then also this OST to PST tool can be used. The software saves Outlook OST emails to PST, Office 365, and Exchange. It converts orphaned or corrupted OST files also. The conversion is fully secured without any glitches or data loss. Intelligent filters, destination options, and interactive user-interface are prominent characteristics of the software.