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You just open the wallet on your node using a browser and start the forging process from your account. Even if you close the browser the node will keep forging in the background.

If you meant to start automatically each time the node / raspberry starts then take a look to the StartForging add-on.

From the changelog:

The StartForging add-on reads the passphrases stored in a plain text file, as
defined in the property nxt.startForgingFile, one passphrase per line, and
automatically starts forging with each of these accounts when the server is
started. Since passphrases are stored unencrypted, this add-on should only
be used on well secured servers, or with accounts of insignificant value, or
in test environments.

How to set  automatic forging of  Ardor node on Rpi?

What does the log file say? This file is located in the "logs" folder inside your Ardor folder and will give you some more details of what the problem may be...

Keep in mind that sometimes waiting a few for minutes with the client running until it finds some more peers would automatically resume the blockchain download.

running on linux, 2.2.6
it says 9 connected and up-to-date peers but not downloading blockchain
message says "blockchain download halted, no connection"
any pointers would be appreciated

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