9.702-1 - Letsencrypt renew and create new failed

Hi,

my Letsencrypt certificates won't renew. I've already tried to disable and enable Letsencrypt, triggering creating a new account, and I also tried to create a new certificate, but new certificates won't get certified either.

Here is the log file:

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2020:06:24-18:55:03 remote letsencrypt[11015]: I Renew certificate: handling CSR REF_CaCsrDomains for domain set [remote.domain.de,home.domain.de,autodiscover.domain.de,userportal.domain.de,mail.domain.de,smtp.domain.de]
2020:06:24-18:55:03 remote letsencrypt[11015]: I Renew certificate: running command: /var/storage/chroot-reverseproxy/usr/dehydrated/bin/dehydrated -x -f /var/storage/chroot-reverseproxy/usr/dehydrated/conf/config -c --accept-terms --domain remote.domain.de --domain home.domain.de --domain autodiscover.domain.de --domain userportal.domain.de --domain mail.domain.de --domain smtp.domain.de
2020:06:24-18:56:01 remote letsencrypt[12271]: E Renew certificate: aborting, failed to acquire an exclusive lock: Resource temporarily unavailable
2020:06:24-18:56:14 remote letsencrypt[11015]: I Renew certificate: command completed with exit code 256
2020:06:24-18:56:14 remote letsencrypt[11015]: E Renew certificate: COMMAND_FAILED: ERROR: Challenge is invalid! (returned: invalid) (result: {
2020:06:24-18:56:14 remote letsencrypt[11015]: E Renew certificate: COMMAND_FAILED: "type": "http-01",
2020:06:24-18:56:14 remote letsencrypt[11015]: E Renew certificate: COMMAND_FAILED: "status": "invalid",
2020:06:24-18:56:14 remote letsencrypt[11015]: E Renew certificate: COMMAND_FAILED: "error": {
2020:06:24-18:56:14 remote letsencrypt[11015]: E Renew certificate: COMMAND_FAILED: "type": "urn:ietf:params:acme:error:connection",
2020:06:24-18:56:14 remote letsencrypt[11015]: E Renew certificate: COMMAND_FAILED: "detail": "Fetching home.domain.de:8888/.../f5N4JXSzIPv6zPf2hIubAa5yJsS6DzPzjpPMberg1NA: Invalid port in redirect target. Only ports 80 and 443 are supported, not 8888",
2020:06:24-18:56:14 remote letsencrypt[11015]: E Renew certificate: COMMAND_FAILED: "status": 400
2020:06:24-18:56:14 remote letsencrypt[11015]: E Renew certificate: COMMAND_FAILED: },
2020:06:24-18:56:14 remote letsencrypt[11015]: E Renew certificate: COMMAND_FAILED: "url": "acme-v02.api.letsencrypt.org/.../rgAEPg",
2020:06:24-18:56:14 remote letsencrypt[11015]: E Renew certificate: COMMAND_FAILED: "token": "f5N4JXSzIPv6zPf2hIubAa5yJsS6DzPzjpPMberg1NA",
2020:06:24-18:56:14 remote letsencrypt[11015]: E Renew certificate: COMMAND_FAILED: "validationRecord": [
2020:06:24-18:56:14 remote letsencrypt[11015]: E Renew certificate: COMMAND_FAILED: {
2020:06:24-18:56:14 remote letsencrypt[11015]: E Renew certificate: COMMAND_FAILED: "url": "userportal.domain.de/.../f5N4JXSzIPv6zPf2hIubAa5yJsS6DzPzjpPMberg1NA",
2020:06:24-18:56:14 remote letsencrypt[11015]: E Renew certificate: COMMAND_FAILED: "hostname": "userportal.domain.de",
2020:06:24-18:56:14 remote letsencrypt[11015]: E Renew certificate: COMMAND_FAILED: "port": "80",
2020:06:24-18:56:14 remote letsencrypt[11015]: E Renew certificate: COMMAND_FAILED: "addressesResolved": [
2020:06:24-18:56:14 remote letsencrypt[11015]: E Renew certificate: COMMAND_FAILED: "134.255.255.204",
2020:06:24-18:56:14 remote letsencrypt[11015]: E Renew certificate: COMMAND_FAILED: "2a00:1563:2543:300::5cc"
2020:06:24-18:56:14 remote letsencrypt[11015]: E Renew certificate: COMMAND_FAILED: ],
2020:06:24-18:56:14 remote letsencrypt[11015]: E Renew certificate: COMMAND_FAILED: "addressUsed": "2a00:6422:2345:340::5cc"
2020:06:24-18:56:14 remote letsencrypt[11015]: E Renew certificate: COMMAND_FAILED: }
2020:06:24-18:56:14 remote letsencrypt[11015]: E Renew certificate: COMMAND_FAILED: ]
2020:06:24-18:56:14 remote letsencrypt[11015]: E Renew certificate: COMMAND_FAILED: })
2020:06:24-18:56:15 remote letsencrypt[11015]: I Renew certificate: sending notification WARN-603
2020:06:24-18:56:15 remote letsencrypt[11015]: [WARN-603] Let's Encrypt certificate renewal failed accessing Let's Encrypt service
2020:06:24-18:56:15 remote letsencrypt[11015]: I Renew certificate: execution completed (CSRs renewed: 0, failed: 1)
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I am running Firmware Version 9.702-1 on a SG115w (Up2Date shows the firmware is up to date and no new available, but I know the 9.703 is out already) and I also rebooted the appliance, too.

Any help would be greatly appreciated!

Thanks in advance!
ipzipzap