After installing the update libcups2 1.5.3-5+deb7u6 I can no longer access the Web GUI....
Reading package lists...
Building dependency tree...
Reading state information...
Suggested packages:
cups-common
The following packages will be upgraded:
libcups2 openmediavault
2 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
Need to get 256 kB/1051 kB of archives.
After this operation, 34.8 kB disk space will be freed.
WARNING: The following packages cannot be authenticated!
libcups2 openmediavault
Authentication warning overridden.
Get:1 http://security.debian.org/ wheezy/updates/main libcups2 amd64 1.5.3-5+deb7u6 [256 kB]
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