[packman] rpmkey-Packman error

[Eberhard Pache]

Hello,
due to elderly hardware I am forced to continue with opensuse 11.0. Updates 
were no problem until you removed 11.0 from your servers. Now I get errors 
when using the mirror servers like (other mirrors alike) 
halifax.rwth-aachen.de/packman/suse/SLE_11/Essentials/ 
It is not possible to install any updates, error message attached. 
Is there something wrong with the key or possibly with my system? Any idea or 
remedy? Thank you for your help. 
Regards E. Pache
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2011-03-19 11:37:37 Fehler bei der Installation von rpmkey-packman-1.0.0-1.pm.2.1.noarch.rpm
rpm-Ausgabe:
error: /var/cache/zypp/packages/Essentials/noarch/rpmkey-packman-1.0.0-1.pm.2.1.noarch.rpm: Header V4 RSA/SHA1 signature: BAD, key ID 1abd1afb
error: /var/cache/zypp/packages/Essentials/noarch/rpmkey-packman-1.0.0-1.pm.2.1.noarch.rpm cannot be installed