Against the backdrop of the progressive use of the Internet, the ECJ has repeatedly been confronted with internet-related issues in recent years. Within this diploma thesis, questions and challenges to European civil procedure law are presented and selected decisions of the ECJ as well as solutions concepts in the literature with regard to procedural questions on the internet are discussed. Firstly, the determination of international jurisdiction in contractual relations on the Internet is described. Both the general place of jurisdiction according to Art 4 Regulation (EU) No 1215/2012 and the special jurisdiction of the place of performance according to Art 7 Regulation (EU) No 1215/2012 for online contracts are explained in detail. In addition, the specific characteristics of consumer contracts via the Internet are examined. Under the conditions of Art 17 to 19 Regulation (EU) No 1215/2012, the possibility of an alternative forum is granted to the typically economically weaker party. In this context, four essential requirements for the jurisdiction over consumer contracts are dealt with: the criteria applied to the entrepreneur's online presence in order to „direct“ his activity to the member state of the consumers domicile; the attribution of activities of third parties; the need for the contract to be concluded at a distance and the necessity of a causal link between the activity directed to the member state of the consumers domicile via an internet site and the conclusion of the contract. The next chapter analyses the possibility of an agreement conferring jurisdiction via internet, with particular reference to so-called click-wrapping agreements considering formal requirements. Subsequently, the jurisdiction for certain torts on the Internet is evaluated by means of selected decisions of the ECJ on infringements of personality rights as well as trade marks by means of content placed online on an internet website before a final conclusion is drawn.