White Screen and Error503 Nextcloud 17

Hi,

I tried to Update from 16.0.8.1 to Nextcloud 17.0.3 with the updater integrated to Nextcloud.
And when the update has been finish, Nextcloud didn’t boot and I remain on a white screen.

I updated my PHP 7.3 to 7.4 but the problem remain, I can’t access Nextcloud.
And the client from my phone give me an Error 503.

I tried to search a way to fix it but I didn’t found any.

I got those information in the Updater LOG
I hope I can easily restore it without the need to remale everything from zero…

> 2020-02-04T22:28:41+0100 xGRxy8nlx7 [info] getChangelogURL()
> 2020-02-04T22:28:41+0100 xGRxy8nlx7 [info] end of checkForUpdate() Update to Nextcloud 17.0.3 available. (channel: "stable")<br /><span class="light">Following file will be downloaded automatically:</span> <code class="light">https://download.nextcloud.com/server/releases/nextcloud-17.0.3.zip</code><br /><a class="external_link" href="https://nextcloud.com/changelog/#17-0-3" target="_blank" rel="noreferrer noopener">Open changelog ↗</a>
> 2020-02-04T22:28:44+0100 nnwZI8VadO [info] request to updater
> 2020-02-04T22:28:44+0100 nnwZI8VadO [info] currentStep()
> 2020-02-04T22:28:44+0100 nnwZI8VadO [info] POST request for step "1"
> 2020-02-04T22:28:44+0100 nnwZI8VadO [info] startStep("1")
> 2020-02-04T22:28:44+0100 nnwZI8VadO [info] checkForExpectedFilesAndFolders()
> 2020-02-04T22:28:44+0100 nnwZI8VadO [info] end of checkForExpectedFilesAndFolders()
> 2020-02-04T22:28:44+0100 nnwZI8VadO [info] endStep("1")
> 2020-02-04T22:28:44+0100 vjCBmM1u5t [info] request to updater
> 2020-02-04T22:28:44+0100 vjCBmM1u5t [info] currentStep()
> 2020-02-04T22:28:44+0100 vjCBmM1u5t [info] Step 1 is in state "end".
> 2020-02-04T22:28:44+0100 vjCBmM1u5t [info] POST request for step "2"
> 2020-02-04T22:28:44+0100 vjCBmM1u5t [info] startStep("2")
> 2020-02-04T22:28:44+0100 vjCBmM1u5t [info] checkWritePermissions()
> 2020-02-04T22:28:44+0100 vjCBmM1u5t [info] end of checkWritePermissions()
> 2020-02-04T22:28:44+0100 vjCBmM1u5t [info] endStep("2")
> 2020-02-04T22:28:44+0100 dTbpKuCYm5 [info] request to updater
> 2020-02-04T22:28:44+0100 dTbpKuCYm5 [info] currentStep()
> 2020-02-04T22:28:44+0100 dTbpKuCYm5 [info] Step 2 is in state "end".
> 2020-02-04T22:28:44+0100 dTbpKuCYm5 [info] POST request for step "3"
> 2020-02-04T22:28:44+0100 dTbpKuCYm5 [info] startStep("3")
> 2020-02-04T22:28:44+0100 dTbpKuCYm5 [info] createBackup()
> 2020-02-04T22:28:59+0100 dTbpKuCYm5 [info] end of createBackup()
> 2020-02-04T22:28:59+0100 dTbpKuCYm5 [info] endStep("3")
> 2020-02-04T22:28:59+0100 KdJA2dnFgh [info] request to updater
> 2020-02-04T22:28:59+0100 KdJA2dnFgh [info] currentStep()
> 2020-02-04T22:28:59+0100 KdJA2dnFgh [info] Step 3 is in state "end".
> 2020-02-04T22:28:59+0100 KdJA2dnFgh [info] POST request for step "4"
> 2020-02-04T22:28:59+0100 KdJA2dnFgh [info] startStep("4")
> 2020-02-04T22:29:00+0100 KdJA2dnFgh [info] downloadUpdate()
> 2020-02-04T22:29:00+0100 KdJA2dnFgh [info] getUpdateServerResponse()
> 2020-02-04T22:29:00+0100 KdJA2dnFgh [info] updaterServer: https://updates.nextcloud.com/updater_server/
> 2020-02-04T22:29:00+0100 KdJA2dnFgh [info] releaseChannel: stable
> 2020-02-04T22:29:00+0100 KdJA2dnFgh [info] internal version: 16.0.8.1
> 2020-02-04T22:29:00+0100 KdJA2dnFgh [info] updateURL: https://updates.nextcloud.com/updater_server/?version=16x0x8x1xxxstablexx2020-01-29T21%3A16%3A38%2B00%3A00+8fb398bfb01ff72763609bb309f770e6a30f58ddx7x3x13
> 2020-02-04T22:29:00+0100 KdJA2dnFgh [info] getUpdateServerResponse response: Array
> (
>     [version] => 17.0.3.1
>     [versionstring] => Nextcloud 17.0.3
>     [url] => https://download.nextcloud.com/server/releases/nextcloud-17.0.3.zip
>     [web] => https://docs.nextcloud.com/server/17/admin_manual/maintenance/upgrade.html
>     [changes] => https://updates.nextcloud.com/changelog_server/?version=17.0.3
>     [autoupdater] => 1
>     [eol] => 0
>     [signature] => bvMtFkhYbMzG4S1S2U75lDkf92GMxtejlcCaVDifjFzlpH2x8FI3Ggu0XHNBMgJv
> VAqGFWl9U4kgAMT+jcrmRLdE8f9TlOXFwvvXA8pr0cxvefzMwhRyEvSOQIqL1m9S
> KtdgK7XLu3vDC6OxsumxV6LJCqYvNZlMYzv8eR44yGttcoF77wxlB4HTugoylDFc
> NdjU7Ie/s9+sUwkx948xHZZEN6jqHTnMBDhJrOEztPnYy0ZNNh3n9QGf9GBTgl/b
> lNbhw20vUeiGhqZeevGVMbNarezC0w3eONLPQH+lvgi9YfSdbqGXT5QvZVHYux8y
> Bqk7JVRm7517qvPooSoLIQ==
> )
> 
> 2020-02-04T22:29:00+0100 KdJA2dnFgh [info] storage location exists
> 2020-02-04T22:29:02+0100 KdJA2dnFgh [info] end of downloadUpdate()
> 2020-02-04T22:29:02+0100 KdJA2dnFgh [info] endStep("4")
> 2020-02-04T22:29:06+0100 lDz1ctPNFd [info] request to updater
> 2020-02-04T22:29:06+0100 lDz1ctPNFd [info] currentStep()
> 2020-02-04T22:29:06+0100 lDz1ctPNFd [info] Step 4 is in state "end".
> 2020-02-04T22:29:06+0100 lDz1ctPNFd [info] POST request for step "5"
> 2020-02-04T22:29:06+0100 lDz1ctPNFd [info] startStep("5")
> 2020-02-04T22:29:09+0100 lDz1ctPNFd [info] verifyIntegrity()
> 2020-02-04T22:29:09+0100 lDz1ctPNFd [info] getUpdateServerResponse()
> 2020-02-04T22:29:09+0100 lDz1ctPNFd [info] updaterServer: https://updates.nextcloud.com/updater_server/
> 2020-02-04T22:29:09+0100 lDz1ctPNFd [info] releaseChannel: stable
> 2020-02-04T22:29:09+0100 lDz1ctPNFd [info] internal version: 16.0.8.1
> 2020-02-04T22:29:09+0100 lDz1ctPNFd [info] updateURL: https://updates.nextcloud.com/updater_server/?version=16x0x8x1xxxstablexx2020-01-29T21%3A16%3A38%2B00%3A00+8fb398bfb01ff72763609bb309f770e6a30f58ddx7x3x13
> 2020-02-04T22:29:10+0100 lDz1ctPNFd [info] getUpdateServerResponse response: Array
> (
>     [version] => 17.0.3.1
>     [versionstring] => Nextcloud 17.0.3
>     [url] => https://download.nextcloud.com/server/releases/nextcloud-17.0.3.zip
>     [web] => https://docs.nextcloud.com/server/17/admin_manual/maintenance/upgrade.html
>     [changes] => https://updates.nextcloud.com/changelog_server/?version=17.0.3
>     [autoupdater] => 1
>     [eol] => 0
>     [signature] => bvMtFkhYbMzG4S1S2U75lDkf92GMxtejlcCaVDifjFzlpH2x8FI3Ggu0XHNBMgJv
> VAqGFWl9U4kgAMT+jcrmRLdE8f9TlOXFwvvXA8pr0cxvefzMwhRyEvSOQIqL1m9S
> KtdgK7XLu3vDC6OxsumxV6LJCqYvNZlMYzv8eR44yGttcoF77wxlB4HTugoylDFc
> NdjU7Ie/s9+sUwkx948xHZZEN6jqHTnMBDhJrOEztPnYy0ZNNh3n9QGf9GBTgl/b
> lNbhw20vUeiGhqZeevGVMbNarezC0w3eONLPQH+lvgi9YfSdbqGXT5QvZVHYux8y
> Bqk7JVRm7517qvPooSoLIQ==
> )
> 
> 2020-02-04T22:29:10+0100 lDz1ctPNFd [info] storage location: /var/www/nextcloud/data/updater-ocguo1gc4087/downloads/
> 2020-02-04T22:29:10+0100 lDz1ctPNFd [info] end of verifyIntegrity()
> 2020-02-04T22:29:10+0100 lDz1ctPNFd [info] endStep("5")
> 2020-02-04T22:29:11+0100 aLQ9CNFv1C [info] request to updater
> 2020-02-04T22:29:11+0100 aLQ9CNFv1C [info] currentStep()
> 2020-02-04T22:29:11+0100 aLQ9CNFv1C [info] Step 5 is in state "end".
> 2020-02-04T22:29:11+0100 aLQ9CNFv1C [info] POST request for step "6"
> 2020-02-04T22:29:11+0100 aLQ9CNFv1C [info] startStep("6")
> 2020-02-04T22:29:11+0100 aLQ9CNFv1C [info] extractDownload()
> 2020-02-04T22:29:11+0100 aLQ9CNFv1C [info] storage location: /var/www/nextcloud/data/updater-ocguo1gc4087/downloads/
> 2020-02-04T22:29:20+0100 aLQ9CNFv1C [info] end of extractDownload()
> 2020-02-04T22:29:20+0100 aLQ9CNFv1C [info] endStep("6")
> 2020-02-04T22:29:20+0100 SUukhBWeCn [info] request to updater
> 2020-02-04T22:29:20+0100 SUukhBWeCn [info] currentStep()
> 2020-02-04T22:29:20+0100 SUukhBWeCn [info] Step 6 is in state "end".
> 2020-02-04T22:29:20+0100 SUukhBWeCn [info] POST request for step "7"
> 2020-02-04T22:29:20+0100 SUukhBWeCn [info] startStep("7")
> 2020-02-04T22:29:21+0100 SUukhBWeCn [info] setMaintenanceMode("true")
> 2020-02-04T22:29:21+0100 SUukhBWeCn [info] configFileName /var/www/nextcloud/updater/../config/config.php
> 2020-02-04T22:29:21+0100 SUukhBWeCn [info] end of setMaintenanceMode()
> 2020-02-04T22:29:21+0100 SUukhBWeCn [info] endStep("7")
> 2020-02-04T22:29:21+0100 wuNKBZSfWj [info] request to updater
> 2020-02-04T22:29:21+0100 wuNKBZSfWj [info] currentStep()
> 2020-02-04T22:29:21+0100 wuNKBZSfWj [info] Step 7 is in state "end".
> 2020-02-04T22:29:21+0100 wuNKBZSfWj [info] POST request for step "8"
> 2020-02-04T22:29:21+0100 wuNKBZSfWj [info] startStep("8")
> 2020-02-04T22:29:21+0100 wuNKBZSfWj [info] replaceEntryPoints()
> 2020-02-04T22:29:21+0100 wuNKBZSfWj [info] replace index.php
> 2020-02-04T22:29:21+0100 wuNKBZSfWj [info] replace status.php
> 2020-02-04T22:29:21+0100 wuNKBZSfWj [info] replace remote.php
> 2020-02-04T22:29:21+0100 wuNKBZSfWj [info] replace public.php
> 2020-02-04T22:29:21+0100 wuNKBZSfWj [info] replace ocs/v1.php
> 2020-02-04T22:29:21+0100 wuNKBZSfWj [info] replace ocs/v2.php
> 2020-02-04T22:29:21+0100 wuNKBZSfWj [info] end of replaceEntryPoints()
> 2020-02-04T22:29:21+0100 wuNKBZSfWj [info] endStep("8")
> 2020-02-04T22:29:21+0100 IKGR8NRCpm [info] request to updater
> 2020-02-04T22:29:21+0100 IKGR8NRCpm [info] currentStep()
> 2020-02-04T22:29:21+0100 IKGR8NRCpm [info] Step 8 is in state "end".
> 2020-02-04T22:29:21+0100 IKGR8NRCpm [info] POST request for step "9"
> 2020-02-04T22:29:21+0100 IKGR8NRCpm [info] startStep("9")
> 2020-02-04T22:29:21+0100 IKGR8NRCpm [info] deleteOldFiles()
> 2020-02-04T22:29:21+0100 IKGR8NRCpm [info] config sample exists
> 2020-02-04T22:29:21+0100 IKGR8NRCpm [info] themes README exists
> 2020-02-04T22:29:28+0100 IKGR8NRCpm [info] end of deleteOldFiles()
> 2020-02-04T22:29:28+0100 IKGR8NRCpm [info] endStep("9")
> 2020-02-04T22:29:28+0100 nhYU23Vuk1 [info] request to updater
> 2020-02-04T22:29:28+0100 nhYU23Vuk1 [info] currentStep()
> 2020-02-04T22:29:28+0100 nhYU23Vuk1 [info] Step 9 is in state "end".
> 2020-02-04T22:29:28+0100 nhYU23Vuk1 [info] POST request for step "10"
> 2020-02-04T22:29:28+0100 nhYU23Vuk1 [info] startStep("10")
> 2020-02-04T22:29:28+0100 nhYU23Vuk1 [info] moveNewVersionInPlace()
> 2020-02-04T22:29:28+0100 nhYU23Vuk1 [info] storage location: /var/www/nextcloud/data/updater-ocguo1gc4087/downloads/nextcloud/
> 2020-02-04T22:29:30+0100 nhYU23Vuk1 [info] end of moveNewVersionInPlace()
> 2020-02-04T22:29:30+0100 nhYU23Vuk1 [info] endStep("10")
> 2020-02-04T22:37:54+0100 4czmaRRUeW [info] request to updater
> 2020-02-04T22:37:54+0100 4czmaRRUeW [info] currentStep()
> 2020-02-04T22:37:54+0100 4czmaRRUeW [info] Step 10 is in state "end".
> 2020-02-04T22:37:54+0100 4czmaRRUeW [info] POST request for step "11"
> 2020-02-04T22:37:54+0100 4czmaRRUeW [info] startStep("11")
> 2020-02-04T22:37:54+0100 4czmaRRUeW [info] setMaintenanceMode("false")
> 2020-02-04T22:37:54+0100 4czmaRRUeW [info] configFileName /var/www/nextcloud/updater/../config/config.php
> 2020-02-04T22:37:54+0100 4czmaRRUeW [info] end of setMaintenanceMode()
> 2020-02-04T22:37:54+0100 4czmaRRUeW [info] endStep("11")
> 2020-02-04T22:37:55+0100 fZUqSVJa0e [info] request to updater
> 2020-02-04T22:37:55+0100 fZUqSVJa0e [info] currentStep()
> 2020-02-04T22:37:55+0100 fZUqSVJa0e [info] Step 11 is in state "end".
> 2020-02-04T22:37:55+0100 fZUqSVJa0e [info] POST request for step "12"
> 2020-02-04T22:37:55+0100 fZUqSVJa0e [info] startStep("12")
> 2020-02-04T22:37:55+0100 fZUqSVJa0e [info] finalize()
> 2020-02-04T22:37:55+0100 fZUqSVJa0e [info] storage location: /var/www/nextcloud/data/updater-ocguo1gc4087/downloads/nextcloud/
> 2020-02-04T22:37:55+0100 fZUqSVJa0e [info] call opcache_reset()
> 2020-02-04T22:37:55+0100 fZUqSVJa0e [info] end of finalize()
> 2020-02-04T22:37:55+0100 fZUqSVJa0e [info] endStep("12")
> 2020-02-04T22:44:09+0100 hnUDC4bPC0 [info] request to updater
> 2020-02-04T22:44:09+0100 hnUDC4bPC0 [info] currentStep()
> 2020-02-04T22:44:09+0100 hnUDC4bPC0 [info] Step 12 is in state "end".
> 2020-02-04T22:44:09+0100 hnUDC4bPC0 [info] show HTML page
> 2020-02-04T22:44:09+0100 hnUDC4bPC0 [info] current version: 17.0.3 build time: 2020-01-29T21:23:47+00:00 b6a2f493bba6d372e9a8813041bf3928d54cf74b
> 2020-02-04T22:44:20+0100 06WCHpKwZL [info] request to updater
> 2020-02-04T22:44:20+0100 06WCHpKwZL [info] currentStep()
> 2020-02-04T22:44:20+0100 06WCHpKwZL [info] Step 12 is in state "end".
> 2020-02-04T22:44:20+0100 06WCHpKwZL [info] show HTML page
> 2020-02-04T22:44:20+0100 06WCHpKwZL [info] current version: 17.0.3 build time: 2020-01-29T21:23:47+00:00 b6a2f493bba6d372e9a8813041bf3928d54cf74b
> 2020-02-04T22:44:35+0100 qNVxkqpC11 [info] request to updater
> 2020-02-04T22:44:35+0100 qNVxkqpC11 [info] currentStep()
> 2020-02-04T22:44:35+0100 qNVxkqpC11 [info] Step 12 is in state "end".
> 2020-02-04T22:44:35+0100 qNVxkqpC11 [info] show HTML page
> 2020-02-04T22:44:35+0100 qNVxkqpC11 [info] current version: 17.0.3 build time: 2020-01-29T21:23:47+00:00 b6a2f493bba6d372e9a8813041bf3928d54cf74b
> 2020-02-04T22:44:47+0100 jQJ7uqtICw [info] request to updater
> 2020-02-04T22:44:47+0100 jQJ7uqtICw [info] currentStep()
> 2020-02-04T22:44:47+0100 jQJ7uqtICw [info] Step 12 is in state "end".
> 2020-02-04T22:44:47+0100 jQJ7uqtICw [info] show HTML page
> 2020-02-04T22:44:47+0100 jQJ7uqtICw [info] current version: 17.0.3 build time: 2020-01-29T21:23:47+00:00 b6a2f493bba6d372e9a8813041bf3928d54cf74b
> 2020-02-04T22:44:55+0100 RPi0nsKfBn [info] request to updater
> 2020-02-04T22:44:55+0100 RPi0nsKfBn [info] currentStep()
> 2020-02-04T22:44:55+0100 RPi0nsKfBn [info] Step 12 is in state "end".
> 2020-02-04T22:44:55+0100 RPi0nsKfBn [info] show HTML page
> 2020-02-04T22:44:55+0100 RPi0nsKfBn [info] current version: 17.0.3 build time: 2020-01-29T21:23:47+00:00 b6a2f493bba6d372e9a8813041bf3928d54cf74b

Nextcloud 17 doesn’t support PHP 7.4, therefore I would recommend to return to PHP 7.3 for the web and cli component.

I checked everything and yes the white screen was already there with PHP 7.2
I tried 7.3 but…