What is totally clear to me is that the entire transition to TLS1.2 all the way 
is potentially messy. We possibly have to remove server definitions in an 
enterprise setup, communications might (or might not) break, and in any case an 
extra server restart is required after everything has been upgraded.

What is not clear to me is what will and will not be encrypted by the TLS once 
it is in place? Will that be everything, all server 2 server and client 2 
server comms? And if so, what can we expect the impact on the CPU load to be? 
Our servers move a substantial amount of data every night ( 50 - 100 TB each ) 
how many CPU’s should we be adding?

And then the administrators… really, is there no way to guarantee that an admin 
can connect to the server using a downlevel client once he has used TLS? At 
least in my world the server and OC get upgraded by one team, while the client 
is managed by a different team, each at their discretion.

> On 29 Aug 2017, at 15:24, Mikhail Tolkonyuk <mtolkonyuk AT CINIMEX DOT RU> 
> wrote:
> 
> You must update server certificate to SHA-256 before upgrading clients or 
> disable SSL in dsm.opt on all of them.
> 
> BAC 8.1.2 remembers server certificate and uses TLS by default, it will work 
> with old 7.1.x SHA-1 (or MD5) certificate until you upgrade server and OC to 
> 8.1.2. During upgrade server generates new SHA-256 certificate and clients no 
> more able to connect to "untrusted server" with new certificate.
> As workaround you can remove dsmcert.idx, dsmcert.kdb, dsmcert.sth files from 
> client folder and reset transport method for node after server update, but 
> it's much easier to solve the issue in advance.
> 
> Check the default cert with the following command:
> gsk8capicmd_64 -cert -list -db C:\tsminst1\cert.kdb -stashed
> 
> For more details watch Tricia's video about TLS 1.2:
> https://youtu.be/QVPrxjmo_aU
> 
> And see technote 2004844:
> https://www-01.ibm.com/support/docview.wss?uid=swg22004844
> 
> 
> -----Original Message-----
> From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf 
> Of Zoltan Forray
> Sent: Tuesday, August 22, 2017 4:03 PM
> To: ADSM-L AT VM.MARIST DOT EDU
> Subject: [ADSM-L] 8.1.2 client and 7.1.7 servers
> 
> Has anyone tried using the latest 8.1.2 clients with 7.1.7 servers?  I 
> haven't had the chance to test such a configuration (since my lone test 
> server is at 8.1.1) and with the dire-warnings in the readme docs, I made 
> sure everyone on my staff knows to NOT install 8.1.2 clients.
> 
> From the readme/docs:
> 
> Upgrade your IBM Spectrum Protect™ servers to Version 8.1.2 before you 
> upgrade the backup-archive clients.
> 
> 
> 
> If you do not upgrade your servers first, communication between servers and 
> clients might be interrupted.
> 
> 
> --
> *Zoltan Forray*
> Spectrum Protect (p.k.a. TSM) Software & Hardware Administrator Xymon Monitor 
> Administrator VMware Administrator Virginia Commonwealth University 
> UCC/Office of Technology Services www.ucc.vcu.edu zforray AT vcu DOT edu - 
> 804-828-4807 Don't be a phishing victim - VCU and other reputable 
> organizations will never use email to request that you reply with your 
> password, social security number or confidential personal information. For 
> more details visit http://infosecurity.vcu.edu/phishing.html

-- 

 Met vriendelijke groeten/Kind Regards,

Remco Post
r.post AT plcs DOT nl
+31 6 248 21 622