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If your users have IE 7 installed, the default timeout is 30 seconds. The following two Microsoft articles will assist in increasing the timeout:
Prior to any installation, upgrade or modification, it is advised that a full backup be done of all related environments. This includes servers, file systems, registry keys, repositories and databases within the related environments.
It is strongly recommended to engage your Systems Administrator to assist with the following steps.
The following client side registry keys need to be added:
1. Click Start, click Run, type RegEdit, and then click OK.
2. Locate and then click the following key in the registry:
3. On the Edit menu, point to New, and then click DWORD Value.
4. Type KeepAliveTimeout and then press ENTER.
5. On the Edit menu, click Modify.
6. In the Base panel, ensure that decimal is selected.
7. Type the appropriate time-out value (in milliseconds). It is recommended that you enter 180000 (3 minutes) or longer if required.
8. Click OK.
9. Repeat steps 3-8 above to add ReceiveTimeout and ServerInfoTimeout per below information:
After making the changes, the client machine must be rebooted.
These registry changes are the recommended settings from Microsoft. In some cases (for example, slower connection speeds), you may need to increase the KeepAliveTimeout if these settings do not work.
Refer: Decompression Error In Smart View on a Refresh (Doc ID 1333061.1) on My Oracle Support.
The last post is correct this is an issue with compression and disabling it will get rid of this message. When the session times out the user will still get an error but the error will not fail decompression.
So if you turn compression off you will get the proper error message but the users will still have to log back in.