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Today I was trying to access a local HTTPS website of an embedded device (a Siemens S7-1500 PLC for the record) that is using a self-signed certificate. I immediately get the SEC_ERROR_REUSED_ISSUER_AND_SERIAL error and I wasn't able to go on (attached image #1, in Italian language). I've certainly browsed a similar PLC webserver in the past, so the fact that the device exposes a similar certificate serial number is not so strange for me, considering also it's self-signed.

The problem is that I cannot follow the instructions of the Mozilla knowledgebase here because I'm not able to identify the correct certificate of the website!

In the attached image #2 you can see that the connection is detected as not encrypted, I suppose because only the form part of the HTML that is posting the data using HTTPS while the rest is using HTTP, but I'm not sure. If I click on the padlock icon (attached image #3) the info about the current certificate is not displayed.

Then I went into Tools > Options and searched for "certificates"; as you can see in the attached images #4 and #5, neither in the Servers tab nor in the Authorities tab I can find any item that is related to 192.168.10.2 (the webserver IP address) or Siemens (the embedded device manufacturer). But unfortunately the error persist! Initially there was a 192.168.10.2:443 line in the Servers tab and I removed it and restarted Firefox, but it didn't solve, so at the moment the situation is the one depicted by the attachments.

I had to use Microsoft Edge to access the website, but I would like to solve this issue and use Firefox instead. Is there anything else I can do to bypass the error? Why doesn't the error page provide a way to correctly identify the wrong certificate using its fingerprint and/or name? Or, maybe, is there a way to disable this check for local IP addresses or for items in a whitelist?

Thanks for your help.

Buona sera. Non riesco ad entrare nel sito www.gametwist.com. Mi dice che il sito non è sicuro. Firefox na rilevato un potenziale problema di sicurezza, Grazie per eventuale risposta.

Prima riuscivo sempre ad entrare nel sito per i miei acquisti ora non più. Ho controllato il mio antivirus a pagamento e li ho interpellati e mi hanno detto che non è dovuto da loro. Ho dato il permesso per il sito ma continua a bloccarmi! Il sito è www [.] Bazzara [.] it Vi ringrazio se potete darmi una soluzione

Con il mini lettore evo, inserendo la CNS, mi viene questo errore:Codice di errore: PR_END_OF_FILE_ERROR - mentre con il brouser edge riesco ad antrare nel sito delle aGENZIE DELLE ENTRATE. cOME FACCIO A RISOLVERLO=?