ActiveDirectory Server 2003
I am using the ActiveDirectoryMembershipProvider and ADroleProvider. They work great. Until my active directory server restarts in the middle of the day to get updates. (I'm not in charge of the server and can't change this). When this happens, for the five minutes the server is rebooting, my users can't use my website because I've tied my menu to the Role Provider. So, here are my questions:
Is it possible to tell my RoleProvider to use the "next" available ADS? If so, how so that while the initial one reboots, I don't frustrate my users with ADS connection messages?
Should I be using some kind of connection pool that automatically reconnects to the available server? If so, how?
Let's imagine that all my active directory servers go down. Is there a way to keep my web application running? Obviously there are bigger problems if all servers are down, but what I'm after is a possible "disconnected" active directory authentication that will still move forward if the server somehow goes kaput. Is this wise AND possible?
You probably have the server connection string set to "server01.domain.local". If you change it to just "domain.local" you're no longer depending on "server01" being online. Instead you will use the Round Robin feature of Active Directory DNS to get a list of all domain controllers and use one that's online. (I don't think your admins reboot all of the domain controllers at the same time...)
Also try running nslookup domain.local a couple of times in succession in a command prompt to see the order changing.
Related
I created MySQL database in RDS of AWS, and successfully connected it from MySQL workbench and Spring Boot application. However, it only works for the 10 to 20 minutes. Then, I can't connect to it anymore.
If I delete the database and create a new one, same problem will happen. It only works in the beginning. Although I haven't changed anything since I created the databases, it still stopped being connectable.
What can be possibly causing it.
Can you check the security group attached to RDS. If you specify a rule to access from specific IP address/address space. Maybe the IP has changed
Reference - RDS Security Groups
My windows service is using integrated authentication and running under Local System account and got the below exception.
The target principal name is incorrect. Cannot generate SSPI context.
The SQL Server Service is running under domain admin user e.g. "domain\administrator". If I change the SQL Server Service to run under Local System account then it fixes the above error.
Can anyone explain why it's happening like this? We have an InstallShield wizard which installs our application on client side i don't know how we can handle this behavior through the wizard. Also changing the user for SQL Server Service is not realistic as well because the client may not allow it.
Note: Once when my windows service works fine and I revert the SQL Server run under the admin account my service runs fine. I guess there are some permissions are set to the local system account.
Before it, I ran the Kerberos which generated the following script to run and fixed the issue. After this it was not required to change the user for SQL Server Service.
SetSPN -d "MSSQLSvc/FQDN" "domain\machine$"
SetSPN -s "MSSQLSvc/FQDN" "domain\administrator"
Please explain why it's happening and what is the best way to handle the situation?
When running under the Local System account, sql-server registers an spn for every service it controls automatcially up to active-directory, and attempts to unregister them when the service shuts down. The Local System account has the ability to communicate over the network as the computer account and thus can indicate to Active Directory as to when to make changes about itself and the SPN SQL Service wants to register. When you change the SQL Server account over to an AD domain user account, the Local System account immediately loses it's ability to control this; therefore you must manually delete the existing SPNs previously registered for that SQL service by Local System before registering new SPNs. You should now notice why its nice that the SQL server script helpfully calls for a deletion of the old SPN followed by the registration of a new one in order to prevent issues. When this isn't done properly - you'll get an authentication error when the kerberos clients obtain a ticket for the old invalid SPN - because it was never deleted and any Kerberos-aware service will always reject a ticket for a wrong SPN. After you make SPN changes, always be sure to restart the SQL Server service and right after that if you’re testing with a user have that user log out and log back in. This answers your main question here.
Please see this Microsoft document for further reading on the subject: Register a Service Principal Name for Kerberos Connections. There's also a very good youtube video on this exact problem, that's where I learned about it and how to resolve it. Ignore "SSRS" in the title, I've watched the entirety and the guidance applies to any and all services by SQL which have SPNs.
You had a secondary question at the very end of your question regarding what is the best way to handle the situation. If you're talking about solving it programmatically that would be very difficult to answer as all environments are different in some way and you will come across SQL instances running in all sorts of different security contexts. In an online forum like this you would probably get different answers from different people. If this were your only question, I think it would get closed by the moderators for "being primarily opinion-based" and likely to attract spam answers. I would suggest you incorporate some kind of guidance about the problem in some form of a Readme file that you should package with the InstallShield wizard.
Side note: I think you should add the kerberos tag to this question - as SPNs are relevant to Kerberos only - and not to any other authentication protocol.
I have 3 SQL servers in a mirror, one acting as witness with a DB mirrored with high safety. When I fail over from principal to mirror, the app goes down and sometimes comes back up after 2 refreshes, sometimes 5 minutes. It keeps trying to connect to the principal (I can see the denied attempts in the log for the user). These are not named instances.
I've tried with and without including "Failover Partner" in the connection string (shouldn't need it with a witness I think). And I am using DNS names for the principal and mirror, matching what it is in "mirroring_partner_instance". I've tried adding a timeout to the connection string and specifying on TCPIP. I've also turned on SQL browser. Just things I have tried based on other posts.
I remember mirror fail overs being very fast, almost instant. Am I just being too impatient? Is there a way to speed up the retry?
I have a Jenkins master running on Windows 2008 SP2 set up with Active Directory authentication. The authentication is working fine and normally there is no issue with Login.
Occasionally however Jenkins will take 4 to 5 minutes to log a user in. This seems to correlate with the amount of time a user has been inactive (i.e. A user who has not logged in for 2 or 3 weeks will experience extremely slow response when trying to log in).
Has anyone else experienced this behavior? I'm really not sure if I should start looking at active directory or Jenkins to troubleshoot this.
The plugin maintainers actively suggest to enable logging (using "hudson.plugins.active_directory" to ALL) and file a bug if a problem happens.
Jenkins slow login with Active directory seens to be almost alway's related to DNS issue. Check your dns Service (srv), NS, DomainDnsZones, _ldap.tcp.domaine.com, _gc._tcp.domaine.com and ForestDnsZone response from your AD/DNS server. If you can't reach all ip/port listed, you will face some random slow loggin (30 or 60 seconds, depend on the query) when the jenkins AD pluggins will try to query those servers/services.
You can easly trap the dns query with tcpdump or wireshark on your jenkin's server or on the DNS server.
tcpdump -i interface port 53
specifying sites can help you to make a potable workaround as that will limit slow loging to only bad result when querying inexistant/unreachable ip/port return by ForestDnsZone.
I'm trying to set up mirroring between two sql 2008 databases on different servers in my internal network, as a test run before doing the same thing with two live servers in different locations.
When I actually try and switch the mirroring on the target DB (with
ALTER DATABASE testdb SET PARTNER = N'TCP://myNetworkAddress:5022') I'm getting an error telling me that the server network address can not be reached or does not exist. A little research suggests this is a fairly unhelpful message that pops up due to a number of possible causes, some of which are not directly related to the server existing or otherwise.
So far I've checked and tried the following to solve this problem:
On the target server, I've verified that in SQL Configuration Manager that "Protocols for SQLEXPRESS" (my local installation is labelled SQLEXPRESS for some reason, even though querying SERVERPROPERTY('Edition') reveals that it's 64-bit Enterprise), and Client Protocols for SQL Native Client 10 all have TCP/IP enabled
I'm using a utility program called CurrPorts to verify that there is a TCP/IP port with the same number specified by the mirroring setup (5022) is open and listening on my machine. Netstat verifies that both machines are listening on this port.
I've run SELECT type_desc, port FROM sys.tcp_endpoints; and
SELECT state_desc, role FROM sys.database_mirroring_endpoints to ensure that everything is set up as it should be. The only thing that confused me was the "role" returns 1 .. not entirely sure what that means.
I've tried to prepare the DB correctly. I've taken backups of the database and the log file from the master DB and restored them on the target database with NORESTORE. I've tried turning mirroring on both while leaving them in the NORESTORE state and running an empty RESTORE ... neither seems to make much difference. Just as a test I also tried to mirror an inactive, nearly empty database that I created but that didn't work either.
I've verified that neither server is behind a firewall (they're both on the same network, although on different machines)
I've no idea where to turn next. I've seen these two troubleshooting help pages:
http://msdn.microsoft.com/en-us/library/ms189127.aspx
http://msdn.microsoft.com/en-us/library/aa337361.aspx
And as far as I can tell I've run through all the points to no avail.
One other thing I'm unsure of is the service accounts box in the wizard. For both databases I've been putting in our high-level access account name which should have full admin permissions on the database - I assumed this was the right thing to do.
I'm not sure where to turn next to try and troubleshoot this problem. Suggestions gratefully received.
Cheers,
Matt
I think that SQL Express can only act as a witness server with this SQL feature, you might get better mileage on ServerFault though.
Mike.
Your network settings might be OK. We got quite non-informative error messages in MS SQL - the problem might be an authorization issue and the server still will be saying "network address can not be reached".
By the way, how the authentication is performed? A MSSQL service (on server1) itself must be runned as a valid db user (on server2, and vice versa) in order to make the mirroring work.