@JColvin I tried uninstalling the drivers for "USB Serial Converter A", reboot and then reinstall the cable drivers. This installed an earlier version of the FTDI drivers than what had been on my machine. Same result 'connect_dw_server' failed. I then updated the drivers in Device Manager, which pulled down the latest Microsoft Hardware Compatibility FTDI drivers. Same result.
I hope you can help me resolve the following: I am very unaware of the
reasons synchronous design in VHDL is so much preferred over
asynchronous
one. Why does Xilinx say that it is a good practice to prefer clock
based
processing rather than event based? There have been explanations around
that such an approach is 'easier', but I really fail to see the
difference.In order to avoid misunderstanding, by 'event based' I mean having some
of the flip-flops clocked by a combinatorial network. This in effect
creates
ff's which are triggered only when needed.From my point of view, the synchronous design is: a) bulky
b) less power efficient c) error prone if used incorrectly (as it most
often
is, according to my experience with the vhdl cores I inspected).I do not know if it results in better cell usage as I work only on cores
of
very moderate sizes. There are possible glitching problems as well but
they
can be dealt with by a cautious design.I know that this requires special treatment of external async signals,
but this is not an issue here.This question was given rise by the woes a synchronous xilinx-based VHDL
core
has given me: it is a core which communicates with the outside world via
the
uc68k type bus. Although the signals on the bus are in effect asynchronous, they chose
to
process them in a synchronous manner, by sampling them
with the internal clock before processing. This poses grave
restrictions on the relationship the bus signals are allowed to have to
the
system clock, i.e. if they arrive in an appropriate time -- being
perfectly
legal buswise -- they can get misinterpreted by the input circuitry. It does work in the original setup, but fails to work if the enable
signals
get too short for the internal circuitry to handle -- which is an
unnecessary
restriction to my mind.Please advise.f.
Xilinx To Download Server Profile Sync Failed
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>
>I know that this requires special treatment of external async signals,
>but this is not an issue here.
>
>This question was given rise by the woes a synchronous xilinx-based VHDL
>core
>has given me: it is a core which communicates with the outside world via
>the
>uc68k type bus.
>
>Although the signals on the bus are in effect asynchronous, they chose
>to
>process them in a synchronous manner, by sampling them
>with the internal clock before processing. This poses grave
>restrictions on the relationship the bus signals are allowed to have to
>the
>system clock, i.e. if they arrive in an appropriate time -- being
>perfectly
>legal buswise -- they can get misinterpreted by the input circuitry.
>
>It does work in the original setup, but fails to work if the enable
>signals
>get too short for the internal circuitry to handle -- which is an
>unnecessary
>restriction to my mind.
Before using or testing this feature, please note that it is extremely important to make sure your server has correct time syncing set up, since the TOTP tokens are time based. If you are alread using e-mail OTP, you can leave this on. The two multi-factor authentication methods can co-exist, users that have TOTP/HOTP set up, will no longer be able to use e-mail OTP. Those that do not have it set, will still be prompted for it in that case.
Symptoms:
Clients are unable to establish an SSL session.
If the backend server sends a Certificate Request with Signature Hash Algorithms set to SHA256, the serverssl profile responds with Certificate + Certificate Verify containing signature signed by SHA1 when ssl-sign-hash in that profile is set to 'ANY'.
Since the backend server does not expect SHA1 the handshake fails.
Impact:
Upgrades to versions that ship the "non-RCS" files will incorrectly retain the ca-bundle.crt from the previous version, instead of keeping the newer version that shipped with those versions.
This can result in certificate verification failures (e.g. for an OCSP stapling profile), or a BIG-IP creating an inconsistent/incomplete certificate chain for a virtual server.
Conditions:
HTTP2 profile is configured and assigned to a virtual.
A client SSL profile is also used on the same virtual.
Client interrupting a connection as well as server is also terminating a connection at the same time.
Symptoms:
If "SSL::disable/enable serverside" is configured in an iRule and oneConnect is configured in the iRule or in the Virtual Server profile, BIG-IP may not receive the backend server's HTTP response for every client's HTTP Request.
Conditions:
1. "SSL::disable/enable serverside" exists in the iRule
2. OneConnect is configured in the iRule or in the VS profile
3. apply the iRule and oneConnect Profile to the VS.
Conditions:
BIG-IP v12.1.1_HF1 and _HF2, with a virtual server configured for FastL4 traffic, and including a profile that enables Full PVA Acceleration is affected. The traffic includes an extreme number of new connections, with minimal data exchanged during each connection. i5800 appliances have shown a 5-7% decrease.
Symptoms:
Your sync-failover device group status says "Sync Failed" and reports the following error in Device Management :: Overview "- Sync error on : Load failed from /Common/BIG-IP1 0107178a:3: Modifying license.maxcores to a value other than 8 is not allowed."
Conditions:
- Add a custom certificate bundle
- Add it to a policy, e.g. create an LTM SSL CA profile and add it to the endpoint security check agent in the access policy.
- Initiate a policy sync.
Symptoms:
One or multiple slave virtual servers cannot be reached in a Multidomain SSO use case. This happens due to a bug during the configuration of the SSO Auth Domains in the Access Profile. When a user attempts to access the virtual, it will not be reachable.
The following message will appear on Warning level in the TMM logs:
Multidomain SSO enabled for profile: . No matching domain found for request host: .
Conditions:
ALL of these conditions must be true:
The TCP Analytics profile is attached to a virtual with both clientside or serverside collection turned off in the profile.
TCP profile has mptcp, rate-pace, tail-loss-probe, fast-open, AND enhanced-loss-recovery all disabled. Also, Nagle, send-buffer, receive-window, proxy-buffer are not in AUTO mode. Finally, rexmt-thresh is 3 and the congestion control algorithm is not delay-based (NewReno, HighSpeed, Cubic). Regrettably, this matches the default TCP profile.
An iRule enables TCP-Analytics when disabled by default in the tcp-analytics profile.
Symptoms:
Virtual server remains in syncookie mode even after the syn flood stops.
As a result of this issue, you might see the following symptoms:
-- Virtual servers that use both FastL4 and HTTP profiles might show incorrect 'Current SYN Cache' stats.
-- Virtual stats 'Current SYN Cache' does not decrease.
Conditions:
This issue occurs when the configuration contains a virtual server that uses FastL4 as a filter (for example, has both the FastL4 profile and layer 7 profile (HTTP) syn flood to the virtual server).
Conditions:
This occurs when using virtual servers configured with one or more ServerSSL profiles, and an SSL/TLS renegotiation occurs, and the server requires the new ClientHello version to match the first ClientHello instead of the previous ServerHello version.
Conditions:
Configuration: LTM with Protocol Security Module provisioned, LTM virtual server with HTTP Protocol Security and local-storage logging profile attached. The log-db entries created by the HTTP Protocol Security logging profile have a truncated support ID.
Conditions:
This can occur any time the analytics configuration was valid in a previous release and is no longer valid. For example, if you have an analytics profile set at pool-member granularity, it will load in 12.0.0 but will fail to load on 12.1.0 as granularity must be set at the virtual-server level, not the pool level.
Workaround:
Fixing the configuration manually is the only option when this occurs. In the pool-member granularity example, you can check all your analytics profiles for granularity pool-member and set them to granularity virtual-server.
Conditions:
- Virtual with RTSP profile.
- 200/OK is received from server in response to the initial SETUP request
- SETUP request was the initial message received on a new connection
Conditions:
TCP-Analytics profile is attached to a virtual server, incoming traffic from large amounts of client-ips and subnets (exact number to cause full table depends on machine type and provisioned modules).
Conditions:
- A configurations with several virtual servers and several configured ltm policies attached to those virtual servers.
- Configuration load: manually using the command tmsh load sys conf, or automatically by an upgrade or full config-sync.
Impact:
When the server name (SNI) is not configured in a clientSSL profile, the system will use the common name of its certificate as its server name, and use it to match/lookup clientSSL profiles when the SSL client specifies SNI in the clienthello. So when the clientSSL profile is using a certificate with multiple common names in the subject, the system might display a different common name from the one that is used to match/lookup clientSSL profiles whose server name is not configured. ff782bc1db
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