Debian 6 Systems Are No Longer supported in UIM 8.51
Does it mean that Debian 6 cannot be added into monitoring or does it mean that UIM cannot be install on Debian 6?
The latest robot release does support Debian 6, see Page 10 of our compatibility support matrix: https://support.nimsoft.com/downloads/doc/NMSCompatibility_SupportMatrix_current.pdf
Also, you can find the list of probes support on Debian 6 under the Linux section of the probe support matrix: https://support.nimsoft.com/downloads/doc/Platform_Support_Availability_current.pdf
Hope this helps.
Kind regards, Ryan