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Getting the same error:

org.apache.commons.httpclient.HttpMethodDirector executeWithRetry INFO: I/O exception (java.net.ConnectException) caught when processing request: Connection refused (Connection refused)

There is no upgrade problem in my mongod.log. Any ideas?

@sulaweyo mongodb-bin "provides" mongodb. So if you install mongodb-bin explicitly, unifi will use it.

As compiling mongodb takes a pretty long time it would be cool if the dependencie could be switched to mongodb-bin. Would save me the edit in the PKGBUILD each time

Getting the following error at startup?:

org.apache.commons.httpclient.HttpMethodDirector executeWithRetry INFO: I/O exception (java.net.ConnectException) caught when processing request: Connection refused (Connection refused)

If so, check your /var/log/unifi/mongod.log for a line like this:

IMPORTANT: UPGRADE PROBLEM: The data files need to be fully upgraded to version 3.6 before attempting an upgrade to 4.0; see http://dochub.mongodb.org/core/4.0-upgrade-fcv for more details.

Basically, that page instructs you to downgrade to MongoDB 3.6 and run a command in the console to bring the database version to 3.6. Once the database is in that state, you can restart Unifi with the newer MongoDB version and it should work. Fortunately, you don't need to uninstall the MongoDB package to do this, you can just run 3.6 from a temporary directory. Here's a summary of the steps I took, which fixed the problem for me:

1. Stop Unifi.

2. Download latest MongoDB 3.6 tarball ("legacy" Linux 64-bit version) from https://www.mongodb.com.

3. Extract to a local directory.

4. From the extracted directory, run: sudo -u unifi ./mongod --dbpath /usr/lib/unifi/data/db --port 27117 --unixSocketPrefix /usr/lib/unifi/run --logappend --logpath /usr/lib/unifi/logs/mongod.log --bind_ip 127.0.0.1

5. From another terminal, run: mongo --shell --port 27117

6. In the Mongo shell, run: db.adminCommand({setFeatureCompatibilityVersion: "3.6"})

7. Exit the Mongo shell.

8. CTRL-C to exit mongod gracefully. The Unifi database should be "upgraded" to 3.6 at this point.

9. Restart Unifi. It should now upgrade the database automatically to 4.0.

Log in and enjoy!

Got this even if its a fresh install:

AnnotationConfigApplicationContext - Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'autoOptimizer' defined in com.ubnt.service.AppContext: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.ubnt.service.I.B]: Factory method 'autoOptimizer' threw exception; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'deviceManager' defined in com.ubnt.service.AppContext: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.ubnt.service.oOOO.D]: Factory method 'deviceManager' threw exception; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'eventManager' defined in com.ubnt.service.AppContext: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.ubnt.service.private.OoOO]: Factory method 'eventManager' threw exception; nested exception is java.lang.NoClassDefFoundError: javax/activation/DataSource [14:55:57,232] <db-server> INFO db - DbServer stopped

I keep getting these errors when starting the JAR

Feb 17, 2019 7:08:06 PM org.apache.commons.httpclient.HttpMethodDirector executeWithRetry

INFO: I/O exception (java.net.ConnectException) caught when processing request: Connection refused (Connection refused)

5.9.29 -> 5.10.12 was upgraded flawless for me.

unifi 5.10.12 has been pulled from ubnt downloads and they have in the last few days put out two upgrades 5.10.15 and 5.10.17. I suggest sticking with 5.9.29 until the 5.10.x stable release stabilizes.

For a reason I don't know, the port of the mongodb instance changed without any previous warning from 27117 to 27017. I had to go in /usr/lib/unifi/data/system.properties and change the unifi.db.port property.