Deregistering of Secondary node of HA fails

[Palazsto]

Hello Guys,

After not successfull patching of ISE destributed deployment, the HA failed (the PAN is patched seccesfully , secondary failed ). I've tried to derigister the second node so I can aplly the patch, but the secondary node desn't go to standalone mode . I've tried stop/start but the situation doesn't change . 

Any advice how to preceed here ?

[ahollifield]

For any failed patch installations, TAC is your best bet.

[poongarg]

After clicking on deregister, if you are getting any error message. At what stage patch install failed. If you had captured the log session? If the patch was installed from GUI or CLI.

show logging application patch.log file may also help to check if there was connectivity issue with repository from this node or some other error. De-register of node may not be required.