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I upgraded by emptying the classes/ folder (but not the lib/ folder).

Seems that this was the issue, I had multiple Jetty versions in the lib folder.
After removing those the error is gone, thanks!

By the way, how did you upgrade?

Could you please check if you have multiple jetty versions under the lib directory?

Could you please post the full Ardor log?

I recently upgraded to Ardor 2.2.6, but now I get an error in the browser, any suggestion on how to fix this?

HTTP ERROR 500
Problem accessing /. Reason:

    Server Error
Caused by:
java.lang.NoSuchMethodError: 'java.security.cert.X509Certificate[] org.eclipse.jetty.util.ssl.SslContextFactory.getX509CertChain(javax.net.ssl.SSLSession)'
   at org.eclipse.jetty.server.SecureRequestCustomizer.getCertChain(SecureRequestCustomizer.java:292)
   at org.eclipse.jetty.server.SecureRequestCustomizer.customize(SecureRequestCustomizer.java:259)
   at org.eclipse.jetty.server.SecureRequestCustomizer.customize(SecureRequestCustomizer.java:170)
   at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:363)
   at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:267)
   at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:305)
   at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:103)
   at org.eclipse.jetty.io.ssl.SslConnection$DecryptedEndPoint.onFillable(SslConnection.java:411)
   at org.eclipse.jetty.io.ssl.SslConnection.onFillable(SslConnection.java:305)
   at org.eclipse.jetty.io.ssl.SslConnection$2.succeeded(SslConnection.java:159)
   at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:103)
   at org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:118)
   at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:333)
   at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:310)
   at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:168)
   at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:126)
   at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:366)
   at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:765)
   at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:683)
   at java.base/java.lang.Thread.run(Thread.java:834)

lsb_release -a:

No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 18.04.3 LTS
Release:        18.04
Codename:       bionic

Ardor log seems OK:

Jan 21 22:06:06 MY-VM run.sh[4864]: 2020-01-21 22:06:06 INFO: main Ardor server 2.2.6 started successfully.
Jan 21 22:06:06 MY-VM run.sh[4864]: 2020-01-21 22:06:06 INFO: main Client UI is at https://localhost:443/index.html

java --version:

openjdk 11.0.5 2019-10-15
OpenJDK Runtime Environment (build 11.0.5+10-post-Ubuntu-0ubuntu1.118.04)
OpenJDK 64-Bit Server VM (build 11.0.5+10-post-Ubuntu-0ubuntu1.118.04, mixed mode, sharing)

Settings in nxt.properties:

nxt.adminPassword=my-admin-password
nxt.apiSSL=true
nxt.apiServerHost=0.0.0.0
nxt.allowedBotHosts=*
nxt.keyStorePath=keystore
nxt.keyStorePassword=my-keystore-password
nxt.dbParams=DB_CLOSE_ON_EXIT=FALSE;MV_STORE=TRUE
nxt.keyStoreType=PKCS12
nxt.apiServerSSLPort=443

Thanks You for anwser
There will be someone who can help me with the loan of 24 hr or 1440 blocks of those 1000 ARDR? The idea is to provide a new user to the network. ARDOR-9FSH-M2KX-PYNB-CZ4L7
I like this ecosystem and I am interested in learning what you need to promote this Blockchain child, I want to be a spokesman its

Even though a loan is possible on the ARDOR blockchain, what is the benefit of it? 1000 ARDR for a lending period of 24 hr is probably not enough to find a block.
Also why should bring this a new user to the network?
Even though, if you want to become a spokesman, you should invest the ~40 $ and buy that amount of ARDR.

Thanks You for anwser
There will be someone who can help me with the loan of 24 hr or 1440 blocks of those 1000 ARDR? The idea is to provide a new user to the network. ARDOR-9FSH-M2KX-PYNB-CZ4L7
I like this ecosystem and I am interested in learning what you need to promote this Blockchain child, I want to be a spokesman its

Hi. In order to forge you need at least 1000 ARDR. The fastest way to get ARDR is buying it from one of the integrated exchanges on the wallet, like Changelly or ChangeHero. Check the "exchanges" icon on the upper right corner of the wallet.

You would need to create an account if you haven't done so: https://ardordocs.jelurida.com/How_to_create_an_account_on_the_Ardor_Platform

Hi everyone, I'm starting with a full node on the phone, I was able to download the complete Blockchain.  configure my WALLET, I present the problem that I have no balance to start forging because my account does not have any transactions.  I cannot request help from any other user because I have no balance to send the message.  In other words I can do nothing.  Will there be any possibility that any of the nodes can help me to start forging?  I obviously don't have ways to make a transfer to my own account.  I like this project because I can handle it from my cell phone and there is a possibility of expanding within all the benefits that this blockchain allows.  I would like to participate in some training to handle the blockchain much better.


I Will waiting for You help

Thanks

We are testing the SIGBRO app, and you are welcome to join.

https://forum.nxter.org/t/sigbro-android-app-v0-testers-feedback/45

You can install the auth Wordpress plugin and let users join your site with their Ardor accountRS. By using the app OR by generating token + entering details manually.
Try it: https://nxter.org/sigbro-auth. Download: https://github.com/Nxter/nxter-sigbro-auth

You can't transfer MS-coins over Wordpress with this plugin, but you have your users' account ID's, so you can generate unsigned transaction QRs of any kind for them.

Hi,

that highly depends on the type of hosting/domain you have. Normally you should find a DNS/Nameserver section on your registrars website.

Here is a short article that might help you: https://www.wired.com/2010/02/set_up_a_dns_name_server/